131217111520 has 48 divisors (see below), whose sum is σ = 338182287408. Its totient is φ = 47715312640.

The previous prime is 131217111511. The next prime is 131217111547. The reversal of 131217111520 is 25111712131.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37275829 + ... + 37279348.

It is an arithmetic number, because the mean of its divisors is an integer number (7045464321).

Almost surely, 2^131217111520 is an apocalyptic number.

131217111520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131217111520 is an abundant number, since it is smaller than the sum of its proper divisors (206965175888).

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

131217111520 is a wasteful number, since it uses less digits than its factorization.

131217111520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74555203 (or 74555195 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 25.

Adding to 131217111520 its reverse (25111712131), we get a palindrome (156328823651).

The spelling of 131217111520 in words is "one hundred thirty-one billion, two hundred seventeen million, one hundred eleven thousand, five hundred twenty".