61511625 has 96 divisors (see below), whose sum is σ = 129662208. Its totient is φ = 27475200.

The previous prime is 61511623. The next prime is 61511647. The reversal of 61511625 is 52611516.

It is a happy number.

It is not a de Polignac number, because 61511625 - 2¹ = 61511623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61511621) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 574822 + ... + 574928.

It is an arithmetic number, because the mean of its divisors is an integer number (1350648).

Almost surely, 2^61511625 is an apocalyptic number.

It is an amenable number.

61511625 is an abundant number, since it is smaller than the sum of its proper divisors (68150583).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61511625 is a wasteful number, since it uses less digits than its factorization.

61511625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 195 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 61511625 is about 7842.9347185859. The cubic root of 61511625 is about 394.7472077980.

It can be divided in two parts, 6151 and 1625, that added together give a 5-th power (7776 = 6⁵).

The spelling of 61511625 in words is "sixty-one million, five hundred eleven thousand, six hundred twenty-five".