131637521 has 2 divisors, whose sum is σ = 131637522. Its totient is φ = 131637520.

The previous prime is 131637449. The next prime is 131637523. The reversal of 131637521 is 125736131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110145025 + 21492496 = 10495^2 + 4636^2 .

It is a cyclic number.

It is not a de Polignac number, because 131637521 - 2²⁶ = 64528657 is a prime.

Together with 131637523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131637523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65818760 + 65818761.

It is an arithmetic number, because the mean of its divisors is an integer number (65818761).

Almost surely, 2^131637521 is an apocalyptic number.

It is an amenable number.

131637521 is a deficient number, since it is larger than the sum of its proper divisors (1).

131637521 is an equidigital number, since it uses as much as digits as its factorization.

131637521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 29.

The square root of 131637521 is about 11473.3395748579. The cubic root of 131637521 is about 508.6978456115.

The spelling of 131637521 in words is "one hundred thirty-one million, six hundred thirty-seven thousand, five hundred twenty-one".