77931047 has 2 divisors, whose sum is σ = 77931048. Its totient is φ = 77931046.

The previous prime is 77931031. The next prime is 77931083. The reversal of 77931047 is 74013977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77931047 - 2⁴ = 77931031 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77931047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77931017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38965523 + 38965524.

It is an arithmetic number, because the mean of its divisors is an integer number (38965524).

Almost surely, 2^77931047 is an apocalyptic number.

77931047 is a deficient number, since it is larger than the sum of its proper divisors (1).

77931047 is an equidigital number, since it uses as much as digits as its factorization.

77931047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37044, while the sum is 38.

The square root of 77931047 is about 8827.8563083004. The cubic root of 77931047 is about 427.1399282166.

The spelling of 77931047 in words is "seventy-seven million, nine hundred thirty-one thousand, forty-seven".