125971531 has 4 divisors (see below), whose sum is σ = 143967472. Its totient is φ = 107975592.

The previous prime is 125971511. The next prime is 125971597. The reversal of 125971531 is 135179521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125971531 - 2⁹ = 125971019 is a prime.

It is a super-2 number, since 2×125971531² = 31737653244967922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125971511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8997960 + ... + 8997973.

It is an arithmetic number, because the mean of its divisors is an integer number (35991868).

Almost surely, 2^125971531 is an apocalyptic number.

125971531 is a deficient number, since it is larger than the sum of its proper divisors (17995941).

125971531 is an equidigital number, since it uses as much as digits as its factorization.

125971531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17995940.

The product of its digits is 9450, while the sum is 34.

The square root of 125971531 is about 11223.7039786338. The cubic root of 125971531 is about 501.2920330918.

The spelling of 125971531 in words is "one hundred twenty-five million, nine hundred seventy-one thousand, five hundred thirty-one".