65961931 has 4 divisors (see below), whose sum is σ = 75385072. Its totient is φ = 56538792.

The previous prime is 65961899. The next prime is 65961943. The reversal of 65961931 is 13916956.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65961931 - 2⁵ = 65961899 is a prime.

It is a super-2 number, since 2×65961931² = 8701952682497522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65961131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4711560 + ... + 4711573.

It is an arithmetic number, because the mean of its divisors is an integer number (18846268).

Almost surely, 2^65961931 is an apocalyptic number.

65961931 is a deficient number, since it is larger than the sum of its proper divisors (9423141).

65961931 is an equidigital number, since it uses as much as digits as its factorization.

65961931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9423140.

The product of its digits is 43740, while the sum is 40.

The square root of 65961931 is about 8121.6950816932. The cubic root of 65961931 is about 404.0462871352.

The spelling of 65961931 in words is "sixty-five million, nine hundred sixty-one thousand, nine hundred thirty-one".