31197109518 has 36 divisors (see below), whose sum is σ = 70660393440. Its totient is φ = 9946901448.

The previous prime is 31197109511. The next prime is 31197109519. The reversal of 31197109518 is 81590179113.

It is a happy number.

31197109518 is a `hidden beast` number, since 3 + 119 + 7 + 10 + 9 + 518 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31197109511) 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 17 ways as a sum of consecutive naturals, for example, 1628638 + ... + 1647681.

Almost surely, 2^31197109518 is an apocalyptic number.

31197109518 is an abundant number, since it is smaller than the sum of its proper divisors (39463283922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31197109518 is a wasteful number, since it uses less digits than its factorization.

31197109518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276373 (or 3276347 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 45.

It can be divided in two parts, 31197 and 109518, that added together give a triangular number (140715 = T₅₃₀).

The spelling of 31197109518 in words is "thirty-one billion, one hundred ninety-seven million, one hundred nine thousand, five hundred eighteen".