31161646460 has 48 divisors (see below), whose sum is σ = 74805265920. Its totient is φ = 10681519680.

The previous prime is 31161646427. The next prime is 31161646469. The reversal of 31161646460 is 6464616113.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31161646469) 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 15 ways as a sum of consecutive naturals, for example, 642875 + ... + 689645.

It is an arithmetic number, because the mean of its divisors is an integer number (1558443040).

Almost surely, 2^31161646460 is an apocalyptic number.

It is an amenable number.

31161646460 is an abundant number, since it is smaller than the sum of its proper divisors (43643619460).

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

31161646460 is a wasteful number, since it uses less digits than its factorization.

31161646460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51546 (or 51544 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 31161646460 in words is "thirty-one billion, one hundred sixty-one million, six hundred forty-six thousand, four hundred sixty".