131540537 has 2 divisors, whose sum is σ = 131540538. Its totient is φ = 131540536.

The previous prime is 131540531. The next prime is 131540551. The reversal of 131540537 is 735045131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107765161 + 23775376 = 10381^2 + 4876^2 .

It is a cyclic number.

It is not a de Polignac number, because 131540537 - 2²⁰ = 130491961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131540531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65770268 + 65770269.

It is an arithmetic number, because the mean of its divisors is an integer number (65770269).

Almost surely, 2^131540537 is an apocalyptic number.

It is an amenable number.

131540537 is a deficient number, since it is larger than the sum of its proper divisors (1).

131540537 is an equidigital number, since it uses as much as digits as its factorization.

131540537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 131540537 is about 11469.1123021793. The cubic root of 131540537 is about 508.5728871335.

Adding to 131540537 its reverse (735045131), we get a palindrome (866585668).

The spelling of 131540537 in words is "one hundred thirty-one million, five hundred forty thousand, five hundred thirty-seven".