2191590394 has 32 divisors (see below), whose sum is σ = 3987688320. Its totient is φ = 881852928.

The previous prime is 2191590391. The next prime is 2191590403. The reversal of 2191590394 is 4930951912.

It is a self number, because there is not a number n which added to its sum of digits gives 2191590394.

It is not an unprimeable number, because it can be changed into a prime (2191590391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88734 + ... + 110710.

It is an arithmetic number, because the mean of its divisors is an integer number (124615260).

Almost surely, 2^2191590394 is an apocalyptic number.

2191590394 is a deficient number, since it is larger than the sum of its proper divisors (1796097926).

2191590394 is a wasteful number, since it uses less digits than its factorization.

2191590394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22422.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 2191590394 is about 46814.4250632217. The cubic root of 2191590394 is about 1298.9321396346.

The spelling of 2191590394 in words is "two billion, one hundred ninety-one million, five hundred ninety thousand, three hundred ninety-four".