31311556542 has 36 divisors (see below), whose sum is σ = 78917904936. Its totient is φ = 8946158760.

The previous prime is 31311556501. The next prime is 31311556547. The reversal of 31311556542 is 24565511313.

31311556542 is a `hidden beast` number, since 31 + 31 + 1 + 5 + 56 + 542 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31311556497 and 31311556506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311556547) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 17749434 + ... + 17751197.

It is an arithmetic number, because the mean of its divisors is an integer number (2192164026).

Almost surely, 2^31311556542 is an apocalyptic number.

31311556542 is an abundant number, since it is smaller than the sum of its proper divisors (47606348394).

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

31311556542 is a wasteful number, since it uses less digits than its factorization.

31311556542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35500653 (or 35500643 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The spelling of 31311556542 in words is "thirty-one billion, three hundred eleven million, five hundred fifty-six thousand, five hundred forty-two".