2191949593 has 2 divisors, whose sum is σ = 2191949594. Its totient is φ = 2191949592.

The previous prime is 2191949527. The next prime is 2191949603. The reversal of 2191949593 is 3959491912.

2191949593 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2018974489 + 172975104 = 44933^2 + 13152^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2191949593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2191949593.

It is not a weakly prime, because it can be changed into another prime (2191949393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095974796 + 1095974797.

It is an arithmetic number, because the mean of its divisors is an integer number (1095974797).

Almost surely, 2^2191949593 is an apocalyptic number.

It is an amenable number.

2191949593 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191949593 is an equidigital number, since it uses as much as digits as its factorization.

2191949593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 787320, while the sum is 52.

The square root of 2191949593 is about 46818.2613197030. The cubic root of 2191949593 is about 1299.0031002239.

The spelling of 2191949593 in words is "two billion, one hundred ninety-one million, nine hundred forty-nine thousand, five hundred ninety-three".