2256085981 has 2 divisors, whose sum is σ = 2256085982. Its totient is φ = 2256085980.

The previous prime is 2256085933. The next prime is 2256086051. The reversal of 2256085981 is 1895806522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2161413081 + 94672900 = 46491^2 + 9730^2 .

It is a cyclic number.

It is not a de Polignac number, because 2256085981 - 2²³ = 2247697373 is a prime.

It is a super-2 number, since 2×2256085981² = 10179847907329464722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2256085901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128042990 + 1128042991.

It is an arithmetic number, because the mean of its divisors is an integer number (1128042991).

Almost surely, 2^2256085981 is an apocalyptic number.

It is an amenable number.

2256085981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2256085981 is an equidigital number, since it uses as much as digits as its factorization.

2256085981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 2256085981 is about 47498.2734528319. The cubic root of 2256085981 is about 1311.5510988193.

The spelling of 2256085981 in words is "two billion, two hundred fifty-six million, eighty-five thousand, nine hundred eighty-one".