2256160981 has 4 divisors (see below), whose sum is σ = 2256895872. Its totient is φ = 2255426092.

The previous prime is 2256160979. The next prime is 2256160987. The reversal of 2256160981 is 1890616522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2256160981 - 2¹ = 2256160979 is a prime.

It is a super-2 number, since 2×2256160981² = 10180524744373764722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256160987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362821 + ... + 368986.

It is an arithmetic number, because the mean of its divisors is an integer number (564223968).

Almost surely, 2^2256160981 is an apocalyptic number.

It is an amenable number.

2256160981 is a deficient number, since it is larger than the sum of its proper divisors (734891).

2256160981 is an equidigital number, since it uses as much as digits as its factorization.

2256160981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734890.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 2256160981 is about 47499.0629486519. The cubic root of 2256160981 is about 1311.5656321369.

The spelling of 2256160981 in words is "two billion, two hundred fifty-six million, one hundred sixty thousand, nine hundred eighty-one".