125515645 has 4 divisors (see below), whose sum is σ = 150618780. Its totient is φ = 100412512.

The previous prime is 125515639. The next prime is 125515657. The reversal of 125515645 is 546515521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17397241 + 108118404 = 4171^2 + 10398^2 .

It is a cyclic number.

It is not a de Polignac number, because 125515645 - 2⁷ = 125515517 is a prime.

It is a super-3 number, since 3×125515645³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 125515645.

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, 12551560 + ... + 12551569.

It is an arithmetic number, because the mean of its divisors is an integer number (37654695).

Almost surely, 2^125515645 is an apocalyptic number.

It is an amenable number.

125515645 is a deficient number, since it is larger than the sum of its proper divisors (25103135).

125515645 is an equidigital number, since it uses as much as digits as its factorization.

125515645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25103134.

The product of its digits is 30000, while the sum is 34.

The square root of 125515645 is about 11203.3764999664. The cubic root of 125515645 is about 500.6865834415.

It can be divided in two parts, 1255 and 15645, that added together give a square (16900 = 130²).

The spelling of 125515645 in words is "one hundred twenty-five million, five hundred fifteen thousand, six hundred forty-five".