2291431993 has 4 divisors (see below), whose sum is σ = 2297204260. Its totient is φ = 2285659728.

The previous prime is 2291431981. The next prime is 2291432069. The reversal of 2291431993 is 3991341922.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1195292329 + 1096139664 = 34573^2 + 33108^2 .

It is a cyclic number.

It is not a de Polignac number, because 2291431993 - 2⁹ = 2291431481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2291431943) 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, 2885538 + ... + 2886331.

It is an arithmetic number, because the mean of its divisors is an integer number (574301065).

Almost surely, 2^2291431993 is an apocalyptic number.

It is an amenable number.

2291431993 is a deficient number, since it is larger than the sum of its proper divisors (5772267).

2291431993 is an equidigital number, since it uses as much as digits as its factorization.

2291431993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5772266.

The product of its digits is 104976, while the sum is 43.

The square root of 2291431993 is about 47868.9042385555. The cubic root of 2291431993 is about 1318.3649776382.

The spelling of 2291431993 in words is "two billion, two hundred ninety-one million, four hundred thirty-one thousand, nine hundred ninety-three".