999450133281601 has 4 divisors (see below), whose sum is σ = 999450212316804. Its totient is φ = 999450054246400.

The previous prime is 999450133281559. The next prime is 999450133281623. The reversal of 999450133281601 is 106182331054999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 245718133809201 + 753731999472400 = 15675399^2 + 27454180^2 .

It is a 3-Lehmer number, since φ(999450133281601) divides (999450133281601-1)³.

It is a cyclic number.

It is not a de Polignac number, because 999450133281601 - 2⁷ = 999450133281473 is a prime.

It is a super-2 number, since 2×999450133281601² (a number of 31 digits) contains 22 as substring.

It is a deceptive number, since it divides R_{999450133281600}.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999450133281601.

It is not an unprimeable number, because it can be changed into a prime (999450133281671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15807040 + ... + 47421121.

It is an arithmetic number, because the mean of its divisors is an integer number (249862553079201).

It is a Poulet number, since it divides 2^{999450133281600}-1.

Almost surely, 2^{999450133281601} is an apocalyptic number.

999450133281601 is the 15807041-st decagonal number.

It is an amenable number.

999450133281601 is a deficient number, since it is larger than the sum of its proper divisors (79035203).

999450133281601 is a wasteful number, since it uses less digits than its factorization.

999450133281601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79035202.

The product of its (nonzero) digits is 12597120, while the sum is 61.

The spelling of 999450133281601 in words is "nine hundred ninety-nine trillion, four hundred fifty billion, one hundred thirty-three million, two hundred eighty-one thousand, six hundred one".