125507557531 has 2 divisors, whose sum is σ = 125507557532. Its totient is φ = 125507557530.

The previous prime is 125507557507. The next prime is 125507557607. The reversal of 125507557531 is 135755705521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125507557531 - 2¹⁵ = 125507524763 is a prime.

It is a super-2 number, since 2×125507557531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125507587531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62753778765 + 62753778766.

It is an arithmetic number, because the mean of its divisors is an integer number (62753778766).

Almost surely, 2^125507557531 is an apocalyptic number.

125507557531 is a deficient number, since it is larger than the sum of its proper divisors (1).

125507557531 is an equidigital number, since it uses as much as digits as its factorization.

125507557531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 918750, while the sum is 46.

The spelling of 125507557531 in words is "one hundred twenty-five billion, five hundred seven million, five hundred fifty-seven thousand, five hundred thirty-one".