2156797331 has 32 divisors (see below), whose sum is σ = 2559997440. Its totient is φ = 1797928704.

The previous prime is 2156797297. The next prime is 2156797339. The reversal of 2156797331 is 1337976512.

It is a de Polignac number, because none of the positive numbers 2^k-2156797331 is a prime.

It is a super-2 number, since 2×2156797331² = 9303549454017447122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2156797339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2516255 + ... + 2517111.

It is an arithmetic number, because the mean of its divisors is an integer number (79999920).

Almost surely, 2^2156797331 is an apocalyptic number.

2156797331 is a deficient number, since it is larger than the sum of its proper divisors (403200109).

2156797331 is a wasteful number, since it uses less digits than its factorization.

2156797331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355.

The product of its digits is 238140, while the sum is 44.

The square root of 2156797331 is about 46441.3321406697. The cubic root of 2156797331 is about 1292.0216145537.

The spelling of 2156797331 in words is "two billion, one hundred fifty-six million, seven hundred ninety-seven thousand, three hundred thirty-one".