77345231 has 2 divisors, whose sum is σ = 77345232. Its totient is φ = 77345230.

The previous prime is 77345227. The next prime is 77345239. The reversal of 77345231 is 13254377.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77345231 - 2² = 77345227 is a prime.

It is a super-2 number, since 2×77345231² = 11964569516886722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77345239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38672615 + 38672616.

It is an arithmetic number, because the mean of its divisors is an integer number (38672616).

Almost surely, 2^77345231 is an apocalyptic number.

77345231 is a deficient number, since it is larger than the sum of its proper divisors (1).

77345231 is an equidigital number, since it uses as much as digits as its factorization.

77345231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 32.

The square root of 77345231 is about 8794.6137493354. The cubic root of 77345231 is about 426.0669496635.

The spelling of 77345231 in words is "seventy-seven million, three hundred forty-five thousand, two hundred thirty-one".