125315521 has 2 divisors, whose sum is σ = 125315522. Its totient is φ = 125315520.

The previous prime is 125315503. The next prime is 125315539. The reversal of 125315521 is 125513521.

It is a balanced prime because it is at equal distance from previous prime (125315503) and next prime (125315539).

It can be written as a sum of positive squares in only one way, i.e., 124634896 + 680625 = 11164^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 125315521 - 2¹⁵ = 125282753 is a prime.

It is not a weakly prime, because it can be changed into another prime (125312521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62657760 + 62657761.

It is an arithmetic number, because the mean of its divisors is an integer number (62657761).

Almost surely, 2^125315521 is an apocalyptic number.

It is an amenable number.

125315521 is a deficient number, since it is larger than the sum of its proper divisors (1).

125315521 is an equidigital number, since it uses as much as digits as its factorization.

125315521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1500, while the sum is 25.

The square root of 125315521 is about 11194.4415224700. The cubic root of 125315521 is about 500.4203411942.

The spelling of 125315521 in words is "one hundred twenty-five million, three hundred fifteen thousand, five hundred twenty-one".