2311591993 has 2 divisors, whose sum is σ = 2311591994. Its totient is φ = 2311591992.

The previous prime is 2311591969. The next prime is 2311591999. The reversal of 2311591993 is 3991951132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2302848144 + 8743849 = 47988^2 + 2957^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311591993 - 2⁹ = 2311591481 is a prime.

It is a super-3 number, since 3×2311591993³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2311591999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155795996 + 1155795997.

It is an arithmetic number, because the mean of its divisors is an integer number (1155795997).

Almost surely, 2^2311591993 is an apocalyptic number.

It is an amenable number.

2311591993 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311591993 is an equidigital number, since it uses as much as digits as its factorization.

2311591993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65610, while the sum is 43.

The square root of 2311591993 is about 48079.0182200094. The cubic root of 2311591993 is about 1322.2200155573.

The spelling of 2311591993 in words is "two billion, three hundred eleven million, five hundred ninety-one thousand, nine hundred ninety-three".