125421731 has 4 divisors (see below), whose sum is σ = 125568600. Its totient is φ = 125274864.

The previous prime is 125421721. The next prime is 125421757. The reversal of 125421731 is 137124521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137124521 = 47 ⋅2917543.

It is a cyclic number.

It is not a de Polignac number, because 125421731 - 2¹⁰ = 125420707 is a prime.

It is a super-2 number, since 2×125421731² = 31461221214072722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125421731.

It is not an unprimeable number, because it can be changed into a prime (125421721) 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, 72146 + ... + 73863.

It is an arithmetic number, because the mean of its divisors is an integer number (31392150).

Almost surely, 2^125421731 is an apocalyptic number.

125421731 is a deficient number, since it is larger than the sum of its proper divisors (146869).

125421731 is an equidigital number, since it uses as much as digits as its factorization.

125421731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146868.

The product of its digits is 1680, while the sum is 26.

The square root of 125421731 is about 11199.1843899455. The cubic root of 125421731 is about 500.5616768021.

The spelling of 125421731 in words is "one hundred twenty-five million, four hundred twenty-one thousand, seven hundred thirty-one".