77790971 has 2 divisors, whose sum is σ = 77790972. Its totient is φ = 77790970.

The previous prime is 77790967. The next prime is 77791027. The reversal of 77790971 is 17909777.

It is a weak prime.

It is an emirp because it is prime and its reverse (17909777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77790971 - 2² = 77790967 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77790961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38895485 + 38895486.

It is an arithmetic number, because the mean of its divisors is an integer number (38895486).

Almost surely, 2^77790971 is an apocalyptic number.

77790971 is a deficient number, since it is larger than the sum of its proper divisors (1).

77790971 is an equidigital number, since it uses as much as digits as its factorization.

77790971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194481, while the sum is 47.

The square root of 77790971 is about 8819.9189905577. The cubic root of 77790971 is about 426.8838559629.

The spelling of 77790971 in words is "seventy-seven million, seven hundred ninety thousand, nine hundred seventy-one".