125615557 has 2 divisors, whose sum is σ = 125615558. Its totient is φ = 125615556.

The previous prime is 125615549. The next prime is 125615561. The reversal of 125615557 is 755516521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122567041 + 3048516 = 11071^2 + 1746^2 .

It is a cyclic number.

It is not a de Polignac number, because 125615557 - 2³ = 125615549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125615587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62807778 + 62807779.

It is an arithmetic number, because the mean of its divisors is an integer number (62807779).

Almost surely, 2^125615557 is an apocalyptic number.

It is an amenable number.

125615557 is a deficient number, since it is larger than the sum of its proper divisors (1).

125615557 is an equidigital number, since it uses as much as digits as its factorization.

125615557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52500, while the sum is 37.

The square root of 125615557 is about 11207.8346258321. The cubic root of 125615557 is about 500.8193991033.

The spelling of 125615557 in words is "one hundred twenty-five million, six hundred fifteen thousand, five hundred fifty-seven".