9971210931 has 32 divisors (see below), whose sum is σ = 14630803200. Its totient is φ = 5990369280.

The previous prime is 9971210929. The next prime is 9971210959. The reversal of 9971210931 is 1390121799.

It is not a de Polignac number, because 9971210931 - 2¹ = 9971210929 is a prime.

It is a super-2 number, since 2×9971210931² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9971210981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1988155 + ... + 1993163.

It is an arithmetic number, because the mean of its divisors is an integer number (457212600).

Almost surely, 2^9971210931 is an apocalyptic number.

9971210931 is a deficient number, since it is larger than the sum of its proper divisors (4659592269).

9971210931 is a wasteful number, since it uses less digits than its factorization.

9971210931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5539.

The product of its (nonzero) digits is 30618, while the sum is 42.

The square root of 9971210931 is about 99855.9509042901. The cubic root of 9971210931 is about 2152.3652305342.

The spelling of 9971210931 in words is "nine billion, nine hundred seventy-one million, two hundred ten thousand, nine hundred thirty-one".