2161929545 has 16 divisors (see below), whose sum is σ = 2604861072. Its totient is φ = 1722531840.

The previous prime is 2161929503. The next prime is 2161929557. The reversal of 2161929545 is 5459291612.

It can be written as a sum of positive squares in 8 ways, for example, as 215619856 + 1946309689 = 14684^2 + 44117^2 .

It is not a de Polignac number, because 2161929545 - 2¹⁸ = 2161667401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2161929496 and 2161929505.

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, 2092349 + ... + 2093381.

It is an arithmetic number, because the mean of its divisors is an integer number (162803817).

Almost surely, 2^2161929545 is an apocalyptic number.

It is an amenable number.

2161929545 is a deficient number, since it is larger than the sum of its proper divisors (442931527).

2161929545 is a wasteful number, since it uses less digits than its factorization.

2161929545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332.

The product of its digits is 194400, while the sum is 44.

The square root of 2161929545 is about 46496.5541196334. The cubic root of 2161929545 is about 1293.0456141532.

The spelling of 2161929545 in words is "two billion, one hundred sixty-one million, nine hundred twenty-nine thousand, five hundred forty-five".