125021613 has 4 divisors (see below), whose sum is σ = 166695488. Its totient is φ = 83347740.

The previous prime is 125021609. The next prime is 125021681. The reversal of 125021613 is 316120521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 316120521 = 3 ⋅105373507.

It is not a de Polignac number, because 125021613 - 2² = 125021609 is a prime.

It is a super-3 number, since 3×125021613³ (a number of 25 digits) contains 333 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 125021613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125021693) 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, 20836933 + ... + 20836938.

It is an arithmetic number, because the mean of its divisors is an integer number (41673872).

Almost surely, 2^125021613 is an apocalyptic number.

It is an amenable number.

125021613 is a deficient number, since it is larger than the sum of its proper divisors (41673875).

125021613 is an equidigital number, since it uses as much as digits as its factorization.

125021613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41673874.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 125021613 is about 11181.3064084659. The cubic root of 125021613 is about 500.0288156726.

The spelling of 125021613 in words is "one hundred twenty-five million, twenty-one thousand, six hundred thirteen".