2256156491 has 4 divisors (see below), whose sum is σ = 2269198032. Its totient is φ = 2243114952.

The previous prime is 2256156481. The next prime is 2256156499. The reversal of 2256156491 is 1946516522.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2256156491 is a prime.

It is a super-2 number, since 2×2256156491² = 10180484223762866162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2256156499) 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 in 3 ways as a sum of consecutive naturals, for example, 6520511 + ... + 6520856.

It is an arithmetic number, because the mean of its divisors is an integer number (567299508).

Almost surely, 2^2256156491 is an apocalyptic number.

2256156491 is a deficient number, since it is larger than the sum of its proper divisors (13041541).

2256156491 is a wasteful number, since it uses less digits than its factorization.

2256156491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13041540.

The product of its digits is 129600, while the sum is 41.

The square root of 2256156491 is about 47499.0156845381. The cubic root of 2256156491 is about 1311.5647620847.

The spelling of 2256156491 in words is "two billion, two hundred fifty-six million, one hundred fifty-six thousand, four hundred ninety-one".