131621780 has 24 divisors (see below), whose sum is σ = 277143552. Its totient is φ = 52508192.

The previous prime is 131621771. The next prime is 131621783. The reversal of 131621780 is 87126131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131621783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 932 + ... + 16251.

It is an arithmetic number, because the mean of its divisors is an integer number (11547648).

Almost surely, 2^131621780 is an apocalyptic number.

131621780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131621780 is an abundant number, since it is smaller than the sum of its proper divisors (145521772).

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

131621780 is a wasteful number, since it uses less digits than its factorization.

131621780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17575 (or 17573 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 131621780 is about 11472.6535727355. The cubic root of 131621780 is about 508.6775683838.

The spelling of 131621780 in words is "one hundred thirty-one million, six hundred twenty-one thousand, seven hundred eighty".