816115457 has 2 divisors, whose sum is σ = 816115458. Its totient is φ = 816115456.

The previous prime is 816115441. The next prime is 816115483. The reversal of 816115457 is 754511618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 690585841 + 125529616 = 26279^2 + 11204^2 .

It is a cyclic number.

It is not a de Polignac number, because 816115457 - 2⁴ = 816115441 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816115457.

It is not a weakly prime, because it can be changed into another prime (816115057) 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, 408057728 + 408057729.

It is an arithmetic number, because the mean of its divisors is an integer number (408057729).

Almost surely, 2^816115457 is an apocalyptic number.

It is an amenable number.

816115457 is a deficient number, since it is larger than the sum of its proper divisors (1).

816115457 is an equidigital number, since it uses as much as digits as its factorization.

816115457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 38.

The square root of 816115457 is about 28567.7345444122. The cubic root of 816115457 is about 934.5098165548.

The spelling of 816115457 in words is "eight hundred sixteen million, one hundred fifteen thousand, four hundred fifty-seven".