2161929875 has 16 divisors (see below), whose sum is σ = 3083530944. Its totient is φ = 1482465600.

The previous prime is 2161929857. The next prime is 2161929881. The reversal of 2161929875 is 5789291612.

It is not a de Polignac number, because 2161929875 - 2¹⁸ = 2161667731 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1234514 + ... + 1236263.

It is an arithmetic number, because the mean of its divisors is an integer number (192720684).

Almost surely, 2^2161929875 is an apocalyptic number.

2161929875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2161929875 is a deficient number, since it is larger than the sum of its proper divisors (921601069).

2161929875 is an equidigital number, since it uses as much as digits as its factorization.

2161929875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470799 (or 2470789 counting only the distinct ones).

The product of its digits is 544320, while the sum is 50.

The square root of 2161929875 is about 46496.5576682834. The cubic root of 2161929875 is about 1293.0456799439.

The spelling of 2161929875 in words is "two billion, one hundred sixty-one million, nine hundred twenty-nine thousand, eight hundred seventy-five".