77900491 has 2 divisors, whose sum is σ = 77900492. Its totient is φ = 77900490.

The previous prime is 77900483. The next prime is 77900497. The reversal of 77900491 is 19400977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77900491 - 2³ = 77900483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77900491.

It is not a weakly prime, because it can be changed into another prime (77900497) 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 as a sum of consecutive naturals, namely, 38950245 + 38950246.

It is an arithmetic number, because the mean of its divisors is an integer number (38950246).

Almost surely, 2^77900491 is an apocalyptic number.

77900491 is a deficient number, since it is larger than the sum of its proper divisors (1).

77900491 is an equidigital number, since it uses as much as digits as its factorization.

77900491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 77900491 is about 8826.1254806398. The cubic root of 77900491 is about 427.0840951251.

The spelling of 77900491 in words is "seventy-seven million, nine hundred thousand, four hundred ninety-one".