77131451 has 2 divisors, whose sum is σ = 77131452. Its totient is φ = 77131450.

The previous prime is 77131423. The next prime is 77131471. The reversal of 77131451 is 15413177.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77131451 - 2²⁶ = 10022587 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (77131471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38565725 + 38565726.

It is an arithmetic number, because the mean of its divisors is an integer number (38565726).

Almost surely, 2^77131451 is an apocalyptic number.

77131451 is a deficient number, since it is larger than the sum of its proper divisors (1).

77131451 is an equidigital number, since it uses as much as digits as its factorization.

77131451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2940, while the sum is 29.

The square root of 77131451 is about 8782.4513092872. The cubic root of 77131451 is about 425.6740418361.

The spelling of 77131451 in words is "seventy-seven million, one hundred thirty-one thousand, four hundred fifty-one".