2156945097 has 16 divisors (see below), whose sum is σ = 2956988160. Its totient is φ = 1397692800.

The previous prime is 2156945071. The next prime is 2156945099. The reversal of 2156945097 is 7905496512.

It is not a de Polignac number, because 2156945097 - 2¹⁴ = 2156928713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2156945099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 979 + ... + 65687.

It is an arithmetic number, because the mean of its divisors is an integer number (184811760).

Almost surely, 2^2156945097 is an apocalyptic number.

It is an amenable number.

2156945097 is a deficient number, since it is larger than the sum of its proper divisors (800043063).

2156945097 is a wasteful number, since it uses less digits than its factorization.

2156945097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65024.

The product of its (nonzero) digits is 680400, while the sum is 48.

The square root of 2156945097 is about 46442.9230023262. The cubic root of 2156945097 is about 1292.0511201086.

It can be divided in two parts, 21569 and 45097, that added together give a palindrome (66666).

The spelling of 2156945097 in words is "two billion, one hundred fifty-six million, nine hundred forty-five thousand, ninety-seven".