131455621 has 8 divisors (see below), whose sum is σ = 143504064. Its totient is φ = 119423520.

The previous prime is 131455589. The next prime is 131455627. The reversal of 131455621 is 126554131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131455621 - 2⁵ = 131455589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131455621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131455627) 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, 17920 + ... + 24166.

It is an arithmetic number, because the mean of its divisors is an integer number (17938008).

Almost surely, 2^131455621 is an apocalyptic number.

131455621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131455621 is a deficient number, since it is larger than the sum of its proper divisors (12048443).

131455621 is a wasteful number, since it uses less digits than its factorization.

131455621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8171.

The product of its digits is 3600, while the sum is 28.

The square root of 131455621 is about 11465.4097615393. The cubic root of 131455621 is about 508.4634271589.

The spelling of 131455621 in words is "one hundred thirty-one million, four hundred fifty-five thousand, six hundred twenty-one".