61551625 has 8 divisors (see below), whose sum is σ = 76816584. Its totient is φ = 49241200.

The previous prime is 61551593. The next prime is 61551631. The reversal of 61551625 is 52615516.

It can be written as a sum of positive squares in 4 ways, for example, as 1132096 + 60419529 = 1064^2 + 7773^2 .

It is not a de Polignac number, because 61551625 - 2⁵ = 61551593 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246082 + ... + 246331.

It is an arithmetic number, because the mean of its divisors is an integer number (9602073).

Almost surely, 2^61551625 is an apocalyptic number.

It is an amenable number.

61551625 is a deficient number, since it is larger than the sum of its proper divisors (15264959).

61551625 is an equidigital number, since it uses as much as digits as its factorization.

61551625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492428 (or 492418 counting only the distinct ones).

The product of its digits is 9000, while the sum is 31.

The square root of 61551625 is about 7845.4843700055. The cubic root of 61551625 is about 394.8327551337.

The spelling of 61551625 in words is "sixty-one million, five hundred fifty-one thousand, six hundred twenty-five".