2164515691 has 16 divisors (see below), whose sum is σ = 2353397760. Its totient is φ = 1978912800.

The previous prime is 2164515673. The next prime is 2164515709. The reversal of 2164515691 is 1965154612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2164515673) and next prime (2164515709).

It is a cyclic number.

It is not a de Polignac number, because 2164515691 - 2⁹ = 2164515179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2164515491) 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, 750390 + ... + 753268.

It is an arithmetic number, because the mean of its divisors is an integer number (147087360).

Almost surely, 2^2164515691 is an apocalyptic number.

2164515691 is a deficient number, since it is larger than the sum of its proper divisors (188882069).

2164515691 is a wasteful number, since it uses less digits than its factorization.

2164515691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426.

The product of its digits is 64800, while the sum is 40.

The square root of 2164515691 is about 46524.3558902216. The cubic root of 2164515691 is about 1293.5609982378.

The spelling of 2164515691 in words is "two billion, one hundred sixty-four million, five hundred fifteen thousand, six hundred ninety-one".