1156256881 has 4 divisors (see below), whose sum is σ = 1245199732. Its totient is φ = 1067314032.

The previous prime is 1156256861. The next prime is 1156256903. The reversal of 1156256881 is 1886526511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 555026481 + 601230400 = 23559^2 + 24520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156256881 - 2⁷ = 1156256753 is a prime.

It is a super-2 number, since 2×1156256881² = 2673859949719696322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156256831) 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, 44471406 + ... + 44471431.

It is an arithmetic number, because the mean of its divisors is an integer number (311299933).

Almost surely, 2^1156256881 is an apocalyptic number.

It is an amenable number.

1156256881 is a deficient number, since it is larger than the sum of its proper divisors (88942851).

1156256881 is an equidigital number, since it uses as much as digits as its factorization.

1156256881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88942850.

The product of its digits is 115200, while the sum is 43.

The square root of 1156256881 is about 34003.7774519244. Note that the first 3 decimals coincide. The cubic root of 1156256881 is about 1049.5861955203.

The spelling of 1156256881 in words is "one billion, one hundred fifty-six million, two hundred fifty-six thousand, eight hundred eighty-one".