2161619208 has 96 divisors (see below), whose sum is σ = 7042900800. Its totient is φ = 585097344.

The previous prime is 2161619203. The next prime is 2161619231. The reversal of 2161619208 is 8029161612.

2161619208 is a `hidden beast` number, since 2 + 1 + 616 + 19 + 20 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2161619203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103291 + ... + 122442.

It is an arithmetic number, because the mean of its divisors is an integer number (73363550).

Almost surely, 2^2161619208 is an apocalyptic number.

2161619208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2161619208 is an abundant number, since it is smaller than the sum of its proper divisors (4881281592).

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

2161619208 is a wasteful number, since it uses less digits than its factorization.

2161619208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225771 (or 225764 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 2161619208 is about 46493.2167955714. The cubic root of 2161619208 is about 1292.9837405520.

The spelling of 2161619208 in words is "two billion, one hundred sixty-one million, six hundred nineteen thousand, two hundred eight".