77132491 has 2 divisors, whose sum is σ = 77132492. Its totient is φ = 77132490.

The previous prime is 77132479. The next prime is 77132509. The reversal of 77132491 is 19423177.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77132491 - 2⁵ = 77132459 is a prime.

It is not a weakly prime, because it can be changed into another prime (77130491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38566245 + 38566246.

It is an arithmetic number, because the mean of its divisors is an integer number (38566246).

Almost surely, 2^77132491 is an apocalyptic number.

77132491 is a deficient number, since it is larger than the sum of its proper divisors (1).

77132491 is an equidigital number, since it uses as much as digits as its factorization.

77132491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 77132491 is about 8782.5105180694. The cubic root of 77132491 is about 425.6759550160.

The spelling of 77132491 in words is "seventy-seven million, one hundred thirty-two thousand, four hundred ninety-one".