2191613393 has 2 divisors, whose sum is σ = 2191613394. Its totient is φ = 2191613392.

The previous prime is 2191613381. The next prime is 2191613399. The reversal of 2191613393 is 3933161912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2058164689 + 133448704 = 45367^2 + 11552^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191613393 - 2²² = 2187419089 is a prime.

It is not a weakly prime, because it can be changed into another prime (2191613399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095806696 + 1095806697.

It is an arithmetic number, because the mean of its divisors is an integer number (1095806697).

Almost surely, 2^2191613393 is an apocalyptic number.

It is an amenable number.

2191613393 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191613393 is an equidigital number, since it uses as much as digits as its factorization.

2191613393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 38.

The square root of 2191613393 is about 46814.6707026761. The cubic root of 2191613393 is about 1298.9366833723.

The spelling of 2191613393 in words is "two billion, one hundred ninety-one million, six hundred thirteen thousand, three hundred ninety-three".