77491963 has 2 divisors, whose sum is σ = 77491964. Its totient is φ = 77491962.

The previous prime is 77491961. The next prime is 77491979. The reversal of 77491963 is 36919477.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77491963 - 2¹ = 77491961 is a prime.

Together with 77491961, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77491961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38745981 + 38745982.

It is an arithmetic number, because the mean of its divisors is an integer number (38745982).

Almost surely, 2^77491963 is an apocalyptic number.

77491963 is a deficient number, since it is larger than the sum of its proper divisors (1).

77491963 is an equidigital number, since it uses as much as digits as its factorization.

77491963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 46.

The square root of 77491963 is about 8802.9519480683. The cubic root of 77491963 is about 426.3362106650.

The spelling of 77491963 in words is "seventy-seven million, four hundred ninety-one thousand, nine hundred sixty-three".