2151697615 has 4 divisors (see below), whose sum is σ = 2582037144. Its totient is φ = 1721358088.

The previous prime is 2151697573. The next prime is 2151697661. The reversal of 2151697615 is 5167961512.

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

It is a cyclic number.

It is not a de Polignac number, because 2151697615 - 2²⁷ = 2017479887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215169757 + ... + 215169766.

It is an arithmetic number, because the mean of its divisors is an integer number (645509286).

Almost surely, 2^2151697615 is an apocalyptic number.

2151697615 is a deficient number, since it is larger than the sum of its proper divisors (430339529).

2151697615 is an equidigital number, since it uses as much as digits as its factorization.

2151697615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430339528.

The product of its digits is 113400, while the sum is 43.

The square root of 2151697615 is about 46386.3947187104. The cubic root of 2151697615 is about 1291.0024887738.

It can be divided in two parts, 215169 and 7615, that added together give a square (222784 = 472²).

The spelling of 2151697615 in words is "two billion, one hundred fifty-one million, six hundred ninety-seven thousand, six hundred fifteen".