131621200 has 30 divisors (see below), whose sum is σ = 316220894. Its totient is φ = 52648320.

The previous prime is 131621141. The next prime is 131621213. The reversal of 131621200 is 2126131.

It can be written as a sum of positive squares in 3 ways, for example, as 20866624 + 110754576 = 4568^2 + 10524^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 164127 + ... + 164926.

Almost surely, 2^131621200 is an apocalyptic number.

131621200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131621200 is an abundant number, since it is smaller than the sum of its proper divisors (184599694).

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

131621200 is a wasteful number, since it uses less digits than its factorization.

131621200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329071 (or 329060 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 131621200 is about 11472.6282952077. The cubic root of 131621200 is about 508.6768212090.

Adding to 131621200 its reverse (2126131), we get a palindrome (133747331).

The spelling of 131621200 in words is "one hundred thirty-one million, six hundred twenty-one thousand, two hundred".