2156197311 has 24 divisors (see below), whose sum is σ = 3367044720. Its totient is φ = 1324999296.

The previous prime is 2156197301. The next prime is 2156197313. The reversal of 2156197311 is 1137916512.

It is a happy number.

2156197311 is a `hidden beast` number, since 2 + 1 + 5 + 619 + 7 + 31 + 1 = 666.

2156197311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2156197311 - 2⁶ = 2156197247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156197313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164070 + ... + 176723.

It is an arithmetic number, because the mean of its divisors is an integer number (140293530).

Almost surely, 2^2156197311 is an apocalyptic number.

2156197311 is a deficient number, since it is larger than the sum of its proper divisors (1210847409).

2156197311 is a wasteful number, since it uses less digits than its factorization.

2156197311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340855 (or 340852 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 2156197311 is about 46434.8717129702. The cubic root of 2156197311 is about 1291.9017901734.

The spelling of 2156197311 in words is "two billion, one hundred fifty-six million, one hundred ninety-seven thousand, three hundred eleven".