2191971190 has 8 divisors (see below), whose sum is σ = 3945548160. Its totient is φ = 876788472.

The previous prime is 2191971163. The next prime is 2191971193. The reversal of 2191971190 is 911791912.

2191971190 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2191971190² = 9609475395580032200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191971193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109598550 + ... + 109598569.

It is an arithmetic number, because the mean of its divisors is an integer number (493193520).

Almost surely, 2^2191971190 is an apocalyptic number.

2191971190 is a deficient number, since it is larger than the sum of its proper divisors (1753576970).

2191971190 is a wasteful number, since it uses less digits than its factorization.

2191971190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219197126.

The product of its (nonzero) digits is 10206, while the sum is 40.

The square root of 2191971190 is about 46818.4919663160. The cubic root of 2191971190 is about 1299.0073665139.

The spelling of 2191971190 in words is "two billion, one hundred ninety-one million, nine hundred seventy-one thousand, one hundred ninety".