999391253386241 has 4 divisors (see below), whose sum is σ = 999391326393684. Its totient is φ = 999391180378800.

The previous prime is 999391253386231. The next prime is 999391253386289. The reversal of 999391253386241 is 142683352193999.

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 354226427377216 + 645164826009025 = 18820904^2 + 25400095^2 .

It is a cyclic number.

It is not a de Polignac number, because 999391253386241 - 2³⁸ = 999116375479297 is a prime.

It is a super-2 number, since 2×999391253386241² (a number of 31 digits) contains 22 as substring.

It is a deceptive number, since it divides R_{999391253386240}.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999391253386231) 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, 9125930 + ... + 45629651.

It is an arithmetic number, because the mean of its divisors is an integer number (249847831598421).

It is a Poulet number, since it divides 2^{999391253386240}-1.

Almost surely, 2^{999391253386241} is an apocalyptic number.

999391253386241 is the 18251861-st octagonal number.

It is an amenable number.

999391253386241 is a deficient number, since it is larger than the sum of its proper divisors (73007443).

999391253386241 is a wasteful number, since it uses less digits than its factorization.

999391253386241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73007442.

The product of its digits is 680244480, while the sum is 74.

The spelling of 999391253386241 in words is "nine hundred ninety-nine trillion, three hundred ninety-one billion, two hundred fifty-three million, three hundred eighty-six thousand, two hundred forty-one".