125531537 has 4 divisors (see below), whose sum is σ = 132138480. Its totient is φ = 118924596.

The previous prime is 125531533. The next prime is 125531557. The reversal of 125531537 is 735135521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125531537 - 2² = 125531533 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125531533) 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 3 ways as a sum of consecutive naturals, for example, 3303443 + ... + 3303480.

It is an arithmetic number, because the mean of its divisors is an integer number (33034620).

Almost surely, 2^125531537 is an apocalyptic number.

It is an amenable number.

125531537 is a deficient number, since it is larger than the sum of its proper divisors (6606943).

125531537 is an equidigital number, since it uses as much as digits as its factorization.

125531537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6606942.

The product of its digits is 15750, while the sum is 32.

The square root of 125531537 is about 11204.0857279833. The cubic root of 125531537 is about 500.7077138097.

The spelling of 125531537 in words is "one hundred twenty-five million, five hundred thirty-one thousand, five hundred thirty-seven".