125531638 has 8 divisors (see below), whose sum is σ = 199373832. Its totient is φ = 59073696.

The previous prime is 125531579. The next prime is 125531641. The reversal of 125531638 is 836135521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 3692107 = 125531638 / (1 + 2 + 5 + 5 + 3 + 1 + 6 + 3 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1846020 + ... + 1846087.

It is an arithmetic number, because the mean of its divisors is an integer number (24921729).

Almost surely, 2^125531638 is an apocalyptic number.

125531638 is a deficient number, since it is larger than the sum of its proper divisors (73842194).

125531638 is a wasteful number, since it uses less digits than its factorization.

125531638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3692126.

The product of its digits is 21600, while the sum is 34.

The square root of 125531638 is about 11204.0902352668. The cubic root of 125531638 is about 500.7078480959.

The spelling of 125531638 in words is "one hundred twenty-five million, five hundred thirty-one thousand, six hundred thirty-eight".