125521637 has 2 divisors, whose sum is σ = 125521638. Its totient is φ = 125521636.

The previous prime is 125521609. The next prime is 125521667. The reversal of 125521637 is 736125521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116942596 + 8579041 = 10814^2 + 2929^2 .

It is a cyclic number.

It is not a de Polignac number, because 125521637 - 2⁸ = 125521381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125521667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62760818 + 62760819.

It is an arithmetic number, because the mean of its divisors is an integer number (62760819).

Almost surely, 2^125521637 is an apocalyptic number.

It is an amenable number.

125521637 is a deficient number, since it is larger than the sum of its proper divisors (1).

125521637 is an equidigital number, since it uses as much as digits as its factorization.

125521637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 32.

The square root of 125521637 is about 11203.6439161551. The cubic root of 125521637 is about 500.6945507518.

The spelling of 125521637 in words is "one hundred twenty-five million, five hundred twenty-one thousand, six hundred thirty-seven".