131621130 has 24 divisors (see below), whose sum is σ = 342215172. Its totient is φ = 35098944.

The previous prime is 131621129. The next prime is 131621131. The reversal of 131621130 is 31126131.

131621130 is a `hidden beast` number, since 1 + 31 + 621 + 13 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (131621129) and next prime (131621131).

It can be written as a sum of positive squares in 2 ways, for example, as 127712601 + 3908529 = 11301^2 + 1977^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131621131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 731139 + ... + 731318.

Almost surely, 2^131621130 is an apocalyptic number.

131621130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131621130 is an abundant number, since it is smaller than the sum of its proper divisors (210594042).

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

131621130 is a wasteful number, since it uses less digits than its factorization.

131621130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462470 (or 1462467 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 131621130 is about 11472.6252444678. The cubic root of 131621130 is about 508.6767310326.

Adding to 131621130 its reverse (31126131), we get a palindrome (162747261).

The spelling of 131621130 in words is "one hundred thirty-one million, six hundred twenty-one thousand, one hundred thirty".