61641625 has 8 divisors (see below), whose sum is σ = 76928904. Its totient is φ = 49313200.

The previous prime is 61641611. The next prime is 61641637. The reversal of 61641625 is 52614616.

It can be written as a sum of positive squares in 4 ways, for example, as 301401 + 61340224 = 549^2 + 7832^2 .

It is not a de Polignac number, because 61641625 - 2¹⁵ = 61608857 is a prime.

It is a Duffinian 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, 246442 + ... + 246691.

It is an arithmetic number, because the mean of its divisors is an integer number (9616113).

Almost surely, 2^61641625 is an apocalyptic number.

It is an amenable number.

61641625 is a deficient number, since it is larger than the sum of its proper divisors (15287279).

61641625 is an equidigital number, since it uses as much as digits as its factorization.

61641625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493148 (or 493138 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 61641625 is about 7851.2180583652. The cubic root of 61641625 is about 395.0251012196.

The spelling of 61641625 in words is "sixty-one million, six hundred forty-one thousand, six hundred twenty-five".