77243931 has 6 divisors (see below), whose sum is σ = 111574580. Its totient is φ = 51495948.

The previous prime is 77243863. The next prime is 77243941. The reversal of 77243931 is 13934277.

It is not a de Polignac number, because 77243931 - 2²¹ = 75146779 is a prime.

It is a super-2 number, since 2×77243931² = 11933249752665522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77243941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4291321 + ... + 4291338.

Almost surely, 2^77243931 is an apocalyptic number.

77243931 is a deficient number, since it is larger than the sum of its proper divisors (34330649).

77243931 is a wasteful number, since it uses less digits than its factorization.

77243931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8582665 (or 8582662 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 77243931 is about 8788.8526554949. The cubic root of 77243931 is about 425.8808600243.

The spelling of 77243931 in words is "seventy-seven million, two hundred forty-three thousand, nine hundred thirty-one".