999038081 has 4 divisors (see below), whose sum is σ = 1033487700. Its totient is φ = 964588464.

The previous prime is 999038077. The next prime is 999038111. The reversal of 999038081 is 180830999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 304188481 + 694849600 = 17441^2 + 26360^2 .

It is a cyclic number.

It is not a de Polignac number, because 999038081 - 2² = 999038077 is a prime.

It is a super-2 number, since 2×999038081² = 1996154174576325122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999038011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17224766 + ... + 17224823.

It is an arithmetic number, because the mean of its divisors is an integer number (258371925).

Almost surely, 2^999038081 is an apocalyptic number.

It is an amenable number.

999038081 is a deficient number, since it is larger than the sum of its proper divisors (34449619).

999038081 is a wasteful number, since it uses less digits than its factorization.

999038081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34449618.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 999038081 is about 31607.5636675781. The cubic root of 999038081 is about 999.6792574686.

The spelling of 999038081 in words is "nine hundred ninety-nine million, thirty-eight thousand, eighty-one".