999974085731 has 16 divisors (see below), whose sum is σ = 1073485695744. Its totient is φ = 928099113984.

The previous prime is 999974085709. The next prime is 999974085767. The reversal of 999974085731 is 137580479999.

It is a cyclic number.

It is not a de Polignac number, because 999974085731 - 2¹⁸ = 999973823587 is a prime.

It is a super-2 number, since 2×999974085731² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999974085031) 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 15 ways as a sum of consecutive naturals, for example, 7437701 + ... + 7570953.

It is an arithmetic number, because the mean of its divisors is an integer number (67092855984).

Almost surely, 2^999974085731 is an apocalyptic number.

999974085731 is a deficient number, since it is larger than the sum of its proper divisors (73511610013).

999974085731 is a wasteful number, since it uses less digits than its factorization.

999974085731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139390.

The product of its (nonzero) digits is 154314720, while the sum is 71.

The spelling of 999974085731 in words is "nine hundred ninety-nine billion, nine hundred seventy-four million, eighty-five thousand, seven hundred thirty-one".