531081116510118 has 32 divisors (see below), whose sum is σ = 1065855084106752. Its totient is φ = 176412568516800.

The previous prime is 531081116510033. The next prime is 531081116510201. The reversal of 531081116510118 is 811015611180135.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 531081116510118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123492978 + ... + 127721093.

It is an arithmetic number, because the mean of its divisors is an integer number (33307971378336).

Almost surely, 2^{531081116510118} is an apocalyptic number.

531081116510118 is an abundant number, since it is smaller than the sum of its proper divisors (534773967596634).

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

531081116510118 is a wasteful number, since it uses less digits than its factorization.

531081116510118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251215300.

The product of its (nonzero) digits is 28800, while the sum is 42.

The spelling of 531081116510118 in words is "five hundred thirty-one trillion, eighty-one billion, one hundred sixteen million, five hundred ten thousand, one hundred eighteen".