61908831 has 6 divisors (see below), whose sum is σ = 89423880. Its totient is φ = 41272548.

The previous prime is 61908773. The next prime is 61908841. The reversal of 61908831 is 13880916.

61908831 is a `hidden beast` number, since 619 + 0 + 8 + 8 + 31 = 666.

It is not a de Polignac number, because 61908831 - 2⁷ = 61908703 is a prime.

It is a super-2 number, since 2×61908831² = 7665406711573122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61908841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3439371 + ... + 3439388.

It is an arithmetic number, because the mean of its divisors is an integer number (14903980).

Almost surely, 2^61908831 is an apocalyptic number.

61908831 is a deficient number, since it is larger than the sum of its proper divisors (27515049).

61908831 is a wasteful number, since it uses less digits than its factorization.

61908831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6878765 (or 6878762 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 61908831 is about 7868.2165069347. The cubic root of 61908831 is about 395.5950674029.

The spelling of 61908831 in words is "sixty-one million, nine hundred eight thousand, eight hundred thirty-one".