61604251 has 8 divisors (see below), whose sum is σ = 66355520. Its totient is φ = 57003912.

The previous prime is 61604237. The next prime is 61604267. The reversal of 61604251 is 15240616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61604251 - 2⁵ = 61604219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61604351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36885 + ... + 38518.

It is an arithmetic number, because the mean of its divisors is an integer number (8294440).

Almost surely, 2^61604251 is an apocalyptic number.

61604251 is a deficient number, since it is larger than the sum of its proper divisors (4751269).

61604251 is a wasteful number, since it uses less digits than its factorization.

61604251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75465.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 61604251 is about 7848.8375572437. The cubic root of 61604251 is about 394.9452490475.

Adding to 61604251 its reverse (15240616), we get a palindrome (76844867).

Subtracting from 61604251 its reverse (15240616), we obtain a triangular number (46363635 = T₉₆₂₉).

The spelling of 61604251 in words is "sixty-one million, six hundred four thousand, two hundred fifty-one".