31261402116 has 120 divisors (see below), whose sum is σ = 93453345216. Its totient is φ = 8926562880.

The previous prime is 31261402087. The next prime is 31261402121. The reversal of 31261402116 is 61120416213.

It is a happy number.

31261402116 is a `hidden beast` number, since 3 + 12 + 614 + 0 + 21 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 31261402116.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5465290 + ... + 5471006.

Almost surely, 2^31261402116 is an apocalyptic number.

31261402116 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31261402116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46726672608).

31261402116 is an abundant number, since it is smaller than the sum of its proper divisors (62191943100).

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

31261402116 is a wasteful number, since it uses less digits than its factorization.

31261402116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8151 (or 8140 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 31261402116 its reverse (61120416213), we get a palindrome (92381818329).

The spelling of 31261402116 in words is "thirty-one billion, two hundred sixty-one million, four hundred two thousand, one hundred sixteen".