8256961 has 2 divisors, whose sum is σ = 8256962. Its totient is φ = 8256960.

The previous prime is 8256929. The next prime is 8256973. The reversal of 8256961 is 1696528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4431025 + 3825936 = 2105^2 + 1956^2 .

It is a cyclic number.

It is not a de Polignac number, because 8256961 - 2⁵ = 8256929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8256961.

It is not a weakly prime, because it can be changed into another prime (8256361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4128480 + 4128481.

It is an arithmetic number, because the mean of its divisors is an integer number (4128481).

Almost surely, 2^8256961 is an apocalyptic number.

It is an amenable number.

8256961 is a deficient number, since it is larger than the sum of its proper divisors (1).

8256961 is an equidigital number, since it uses as much as digits as its factorization.

8256961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 8256961 is about 2873.4928223331. The cubic root of 8256961 is about 202.1188155029.

The spelling of 8256961 in words is "eight million, two hundred fifty-six thousand, nine hundred sixty-one".