2191645190 has 16 divisors (see below), whose sum is σ = 4508527392. Its totient is φ = 751421184.

The previous prime is 2191645177. The next prime is 2191645207. The reversal of 2191645190 is 915461912.

It is a super-2 number, since 2×2191645190² = 9606617277700272200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15654539 + ... + 15654678.

It is an arithmetic number, because the mean of its divisors is an integer number (281782962).

Almost surely, 2^2191645190 is an apocalyptic number.

2191645190 is an abundant number, since it is smaller than the sum of its proper divisors (2316882202).

2191645190 is a wasteful number, since it uses less digits than its factorization.

2191645190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31309231.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 2191645190 is about 46815.0103065246. The cubic root of 2191645190 is about 1298.9429652117.

The spelling of 2191645190 in words is "two billion, one hundred ninety-one million, six hundred forty-five thousand, one hundred ninety".