776495381 has 2 divisors, whose sum is σ = 776495382. Its totient is φ = 776495380.

The previous prime is 776495359. The next prime is 776495389. The reversal of 776495381 is 183594677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 578643025 + 197852356 = 24055^2 + 14066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-776495381 is a prime.

It is a super-2 number, since 2×776495381² = 1205890153428670322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (776495389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388247690 + 388247691.

It is an arithmetic number, because the mean of its divisors is an integer number (388247691).

Almost surely, 2^776495381 is an apocalyptic number.

It is an amenable number.

776495381 is a deficient number, since it is larger than the sum of its proper divisors (1).

776495381 is an equidigital number, since it uses as much as digits as its factorization.

776495381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The square root of 776495381 is about 27865.6667065405. Note that the first 3 decimals coincide. The cubic root of 776495381 is about 919.1356804475.

The spelling of 776495381 in words is "seven hundred seventy-six million, four hundred ninety-five thousand, three hundred eighty-one".