125166531 has 20 divisors (see below), whose sum is σ = 194703112. Its totient is φ = 71519616.

The previous prime is 125166521. The next prime is 125166551. The reversal of 125166531 is 135661521.

It is not a de Polignac number, because 125166531 - 2⁷ = 125166403 is a prime.

It is a super-2 number, since 2×125166531² = 31333320965147922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125166521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1486 + ... + 15891.

Almost surely, 2^125166531 is an apocalyptic number.

125166531 is a deficient number, since it is larger than the sum of its proper divisors (69536581).

125166531 is an frugal number, since it uses more digits than its factorization.

125166531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17408 (or 17387 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 125166531 is about 11187.7849014003. The cubic root of 125166531 is about 500.2219428015.

The spelling of 125166531 in words is "one hundred twenty-five million, one hundred sixty-six thousand, five hundred thirty-one".