61039931 has 2 divisors, whose sum is σ = 61039932. Its totient is φ = 61039930.

The previous prime is 61039831. The next prime is 61039949. The reversal of 61039931 is 13993016.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61039931 is a prime.

It is a super-2 number, since 2×61039931² = 7451746352969522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61039991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30519965 + 30519966.

It is an arithmetic number, because the mean of its divisors is an integer number (30519966).

Almost surely, 2^61039931 is an apocalyptic number.

61039931 is a deficient number, since it is larger than the sum of its proper divisors (1).

61039931 is an equidigital number, since it uses as much as digits as its factorization.

61039931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 61039931 is about 7812.8055780238. The cubic root of 61039931 is about 393.7355948035.

The spelling of 61039931 in words is "sixty-one million, thirty-nine thousand, nine hundred thirty-one".