131621536 has 48 divisors (see below), whose sum is σ = 269015040. Its totient is φ = 63325440.

The previous prime is 131621527. The next prime is 131621557. The reversal of 131621536 is 635126131.

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, 274545 + ... + 275023.

It is an arithmetic number, because the mean of its divisors is an integer number (5604480).

Almost surely, 2^131621536 is an apocalyptic number.

131621536 is a gapful number since it is divisible by the number (16) 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 131621536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134507520).

131621536 is an abundant number, since it is smaller than the sum of its proper divisors (137393504).

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

131621536 is a wasteful number, since it uses less digits than its factorization.

131621536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 789 counting only the distinct ones).

The product of its digits is 3240, while the sum is 28.

The square root of 131621536 is about 11472.6429387478. The cubic root of 131621536 is about 508.6772540554.

Adding to 131621536 its reverse (635126131), we get a palindrome (766747667).

The spelling of 131621536 in words is "one hundred thirty-one million, six hundred twenty-one thousand, five hundred thirty-six".