77797849 has 2 divisors, whose sum is σ = 77797850. Its totient is φ = 77797848.

The previous prime is 77797843. The next prime is 77797859. The reversal of 77797849 is 94879777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76247824 + 1550025 = 8732^2 + 1245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77797849 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77797793 and 77797802.

It is not a weakly prime, because it can be changed into another prime (77797843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38898924 + 38898925.

It is an arithmetic number, because the mean of its divisors is an integer number (38898925).

Almost surely, 2^77797849 is an apocalyptic number.

It is an amenable number.

77797849 is a deficient number, since it is larger than the sum of its proper divisors (1).

77797849 is an equidigital number, since it uses as much as digits as its factorization.

77797849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6223392, while the sum is 58.

The square root of 77797849 is about 8820.3088948177. The cubic root of 77797849 is about 426.8964367745.

The spelling of 77797849 in words is "seventy-seven million, seven hundred ninety-seven thousand, eight hundred forty-nine".