9918312831 has 12 divisors (see below), whose sum is σ = 16373087952. Its totient is φ = 5667607296.

The previous prime is 9918312799. The next prime is 9918312871. The reversal of 9918312831 is 1382138199.

It is not a de Polignac number, because 9918312831 - 2⁵ = 9918312799 is a prime.

It is a super-2 number, since 2×9918312831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9918312871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78716706 + ... + 78716831.

It is an arithmetic number, because the mean of its divisors is an integer number (1364423996).

Almost surely, 2^9918312831 is an apocalyptic number.

9918312831 is a deficient number, since it is larger than the sum of its proper divisors (6454775121).

9918312831 is a wasteful number, since it uses less digits than its factorization.

9918312831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157433550 (or 157433547 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 9918312831 is about 99590.7266315494. The cubic root of 9918312831 is about 2148.5523213481.

The spelling of 9918312831 in words is "nine billion, nine hundred eighteen million, three hundred twelve thousand, eight hundred thirty-one".