2165515351 has 4 divisors (see below), whose sum is σ = 2165628400. Its totient is φ = 2165402304.

The previous prime is 2165515309. The next prime is 2165515361. The reversal of 2165515351 is 1535155612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2165515351 - 2²³ = 2157126743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165515361) 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, 19866 + ... + 68743.

It is an arithmetic number, because the mean of its divisors is an integer number (541407100).

Almost surely, 2^2165515351 is an apocalyptic number.

2165515351 is a deficient number, since it is larger than the sum of its proper divisors (113049).

2165515351 is an equidigital number, since it uses as much as digits as its factorization.

2165515351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113048.

The product of its digits is 22500, while the sum is 34.

The square root of 2165515351 is about 46535.0980551239. The cubic root of 2165515351 is about 1293.7601070072.

The spelling of 2165515351 in words is "two billion, one hundred sixty-five million, five hundred fifteen thousand, three hundred fifty-one".