131624021 has 4 divisors (see below), whose sum is σ = 132313344. Its totient is φ = 130934700.

The previous prime is 131623997. The next prime is 131624041. The reversal of 131624021 is 120426131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120426131 = 7 ⋅17203733.

It is a cyclic number.

It is not a de Polignac number, because 131624021 - 2⁶ = 131623957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131623984 and 131624002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131624041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344375 + ... + 344756.

It is an arithmetic number, because the mean of its divisors is an integer number (33078336).

Almost surely, 2^131624021 is an apocalyptic number.

It is an amenable number.

131624021 is a deficient number, since it is larger than the sum of its proper divisors (689323).

131624021 is an equidigital number, since it uses as much as digits as its factorization.

131624021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689322.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 131624021 is about 11472.7512393497. The cubic root of 131624021 is about 508.6804552919.

The spelling of 131624021 in words is "one hundred thirty-one million, six hundred twenty-four thousand, twenty-one".