61318931 has 8 divisors (see below), whose sum is σ = 62673600. Its totient is φ = 59978880.

The previous prime is 61318919. The next prime is 61318967. The reversal of 61318931 is 13981316.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61318931 is a prime.

It is a super-2 number, since 2×61318931² = 7520022597965522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61318981) 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, 5051 + ... + 12171.

It is an arithmetic number, because the mean of its divisors is an integer number (7834200).

Almost surely, 2^61318931 is an apocalyptic number.

61318931 is a deficient number, since it is larger than the sum of its proper divisors (1354669).

61318931 is a wasteful number, since it uses less digits than its factorization.

61318931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7309.

The product of its digits is 3888, while the sum is 32.

The square root of 61318931 is about 7830.6405229713. The cubic root of 61318931 is about 394.3345758464.

The spelling of 61318931 in words is "sixty-one million, three hundred eighteen thousand, nine hundred thirty-one".