776891161 has 2 divisors, whose sum is σ = 776891162. Its totient is φ = 776891160.

The previous prime is 776891117. The next prime is 776891189. The reversal of 776891161 is 161198677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 764246025 + 12645136 = 27645^2 + 3556^2 .

It is a cyclic number.

It is not a de Polignac number, because 776891161 - 2¹⁵ = 776858393 is a prime.

It is not a weakly prime, because it can be changed into another prime (776891111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388445580 + 388445581.

It is an arithmetic number, because the mean of its divisors is an integer number (388445581).

Almost surely, 2^776891161 is an apocalyptic number.

It is an amenable number.

776891161 is a deficient number, since it is larger than the sum of its proper divisors (1).

776891161 is an equidigital number, since it uses as much as digits as its factorization.

776891161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 46.

The square root of 776891161 is about 27872.7673724731. The cubic root of 776891161 is about 919.2918151954.

The spelling of 776891161 in words is "seven hundred seventy-six million, eight hundred ninety-one thousand, one hundred sixty-one".