77944931 has 2 divisors, whose sum is σ = 77944932. Its totient is φ = 77944930.

The previous prime is 77944921. The next prime is 77944963. The reversal of 77944931 is 13944977.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77944931 - 2¹⁴ = 77928547 is a prime.

It is a super-2 number, since 2×77944931² = 12150824537189522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (77944901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38972465 + 38972466.

It is an arithmetic number, because the mean of its divisors is an integer number (38972466).

Almost surely, 2^77944931 is an apocalyptic number.

77944931 is a deficient number, since it is larger than the sum of its proper divisors (1).

77944931 is an equidigital number, since it uses as much as digits as its factorization.

77944931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 77944931 is about 8828.6426476554. The cubic root of 77944931 is about 427.1652927700.

The spelling of 77944931 in words is "seventy-seven million, nine hundred forty-four thousand, nine hundred thirty-one".