2161478892 has 18 divisors (see below), whose sum is σ = 5043826564. Its totient is φ = 720439280.

The previous prime is 2161478867. The next prime is 2161478899. The reversal of 2161478892 is 2988741612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2161478899) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154342 + ... + 167762.

Almost surely, 2^2161478892 is an apocalyptic number.

It is an amenable number.

2161478892 is an abundant number, since it is smaller than the sum of its proper divisors (2882347672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161478892 is an frugal number, since it uses more digits than its factorization.

2161478892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26849 (or 13426 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 2161478892 is about 46491.7077767638. The cubic root of 2161478892 is about 1292.9557630323.

Multiplying 2161478892 by its sum of digits (48), we get a square (103750986816 = 322104²).

The spelling of 2161478892 in words is "two billion, one hundred sixty-one million, four hundred seventy-eight thousand, eight hundred ninety-two".