9999997431 has 32 divisors (see below), whose sum is σ = 14951443968. Its totient is φ = 5912079360.

The previous prime is 9999997417. The next prime is 9999997493. The reversal of 9999997431 is 1347999999.

It is not a de Polignac number, because 9999997431 - 2⁷ = 9999997303 is a prime.

It is a super-2 number, since 2×9999997431² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999997411) 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 31 ways as a sum of consecutive naturals, for example, 14971 + ... + 142211.

It is an arithmetic number, because the mean of its divisors is an integer number (467232624).

Almost surely, 2^9999997431 is an apocalyptic number.

9999997431 is a deficient number, since it is larger than the sum of its proper divisors (4951446537).

9999997431 is a wasteful number, since it uses less digits than its factorization.

9999997431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127351.

The product of its digits is 44641044, while the sum is 69.

The square root of 9999997431 is about 99999.9871549992. The cubic root of 9999997431 is about 2154.4345055404.

The spelling of 9999997431 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, four hundred thirty-one".