61917725 has 24 divisors (see below), whose sum is σ = 80619840. Its totient is φ = 47083520.

The previous prime is 61917683. The next prime is 61917731. The reversal of 61917725 is 52771916.

61917725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61917725 - 2⁸ = 61917469 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147566 + ... + 147984.

It is an arithmetic number, because the mean of its divisors is an integer number (3359160).

Almost surely, 2^61917725 is an apocalyptic number.

61917725 is the 6425-th pentagonal number.

It is an amenable number.

61917725 is a deficient number, since it is larger than the sum of its proper divisors (18702115).

61917725 is a wasteful number, since it uses less digits than its factorization.

61917725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709 (or 704 counting only the distinct ones).

The product of its digits is 26460, while the sum is 38.

The square root of 61917725 is about 7868.7816718981. The cubic root of 61917725 is about 395.6140106026.

The spelling of 61917725 in words is "sixty-one million, nine hundred seventeen thousand, seven hundred twenty-five".