131662621 has 2 divisors, whose sum is σ = 131662622. Its totient is φ = 131662620.

The previous prime is 131662591. The next prime is 131662667. The reversal of 131662621 is 126266131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125216100 + 6446521 = 11190^2 + 2539^2 .

It is a cyclic number.

It is not a de Polignac number, because 131662621 - 2⁵ = 131662589 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131662621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131662681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65831310 + 65831311.

It is an arithmetic number, because the mean of its divisors is an integer number (65831311).

Almost surely, 2^131662621 is an apocalyptic number.

It is an amenable number.

131662621 is a deficient number, since it is larger than the sum of its proper divisors (1).

131662621 is an equidigital number, since it uses as much as digits as its factorization.

131662621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 131662621 is about 11474.4333629160. The cubic root of 131662621 is about 508.7301755642.

The spelling of 131662621 in words is "one hundred thirty-one million, six hundred sixty-two thousand, six hundred twenty-one".