999325681 has 4 divisors (see below), whose sum is σ = 1003507200. Its totient is φ = 995144164.

The previous prime is 999325669. The next prime is 999325753. The reversal of 999325681 is 186523999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186523999 = 593 ⋅314543.

It is a cyclic number.

It is not a de Polignac number, because 999325681 - 2⁹ = 999325169 is a prime.

It is a super-2 number, since 2×999325681² = 1997303633412227522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999325601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2090401 + ... + 2090878.

It is an arithmetic number, because the mean of its divisors is an integer number (250876800).

Almost surely, 2^999325681 is an apocalyptic number.

It is an amenable number.

999325681 is a deficient number, since it is larger than the sum of its proper divisors (4181519).

999325681 is a wasteful number, since it uses less digits than its factorization.

999325681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4181518.

The product of its digits is 1049760, while the sum is 52.

The square root of 999325681 is about 31612.1128841462. The cubic root of 999325681 is about 999.7751764582.

The spelling of 999325681 in words is "nine hundred ninety-nine million, three hundred twenty-five thousand, six hundred eighty-one".