77000491 has 2 divisors, whose sum is σ = 77000492. Its totient is φ = 77000490.

The previous prime is 77000489. The next prime is 77000503. The reversal of 77000491 is 19400077.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77000491 - 2¹ = 77000489 is a prime.

It is a super-2 number, since 2×77000491² = 11858151228482162, which contains 22 as substring.

Together with 77000489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77000411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38500245 + 38500246.

It is an arithmetic number, because the mean of its divisors is an integer number (38500246).

Almost surely, 2^77000491 is an apocalyptic number.

77000491 is a deficient number, since it is larger than the sum of its proper divisors (1).

77000491 is an equidigital number, since it uses as much as digits as its factorization.

77000491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 77000491 is about 8774.9923646690. The cubic root of 77000491 is about 425.4329907830.

The spelling of 77000491 in words is "seventy-seven million, four hundred ninety-one", and thus it is an aban number.