776888081 has 2 divisors, whose sum is σ = 776888082. Its totient is φ = 776888080.

The previous prime is 776888039. The next prime is 776888113. The reversal of 776888081 is 180888677.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 568345600 + 208542481 = 23840^2 + 14441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-776888081 is a prime.

It is a super-2 number, since 2×776888081² = 1207110180799725122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (776888011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388444040 + 388444041.

It is an arithmetic number, because the mean of its divisors is an integer number (388444041).

Almost surely, 2^776888081 is an apocalyptic number.

It is an amenable number.

776888081 is a deficient number, since it is larger than the sum of its proper divisors (1).

776888081 is an equidigital number, since it uses as much as digits as its factorization.

776888081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1204224, while the sum is 53.

The square root of 776888081 is about 27872.7121213563. The cubic root of 776888081 is about 919.2906003438.

The spelling of 776888081 in words is "seven hundred seventy-six million, eight hundred eighty-eight thousand, eighty-one".