816256277 has 2 divisors, whose sum is σ = 816256278. Its totient is φ = 816256276.

The previous prime is 816256253. The next prime is 816256303. The reversal of 816256277 is 772652618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 808890481 + 7365796 = 28441^2 + 2714^2 .

It is a cyclic number.

It is not a de Polignac number, because 816256277 - 2⁶ = 816256213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816256247) 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, 408128138 + 408128139.

It is an arithmetic number, because the mean of its divisors is an integer number (408128139).

Almost surely, 2^816256277 is an apocalyptic number.

It is an amenable number.

816256277 is a deficient number, since it is larger than the sum of its proper divisors (1).

816256277 is an equidigital number, since it uses as much as digits as its factorization.

816256277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 44.

The square root of 816256277 is about 28570.1991067616. The cubic root of 816256277 is about 934.5635630776.

The spelling of 816256277 in words is "eight hundred sixteen million, two hundred fifty-six thousand, two hundred seventy-seven".