2391761993 has 8 divisors (see below), whose sum is σ = 2433955080. Its totient is φ = 2349665280.

The previous prime is 2391761989. The next prime is 2391762007. The reversal of 2391761993 is 3991671932.

It can be written as a sum of positive squares in 4 ways, for example, as 1236544 + 2390525449 = 1112^2 + 48893^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2391761993 - 2² = 2391761989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2391761903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26921 + ... + 74217.

It is an arithmetic number, because the mean of its divisors is an integer number (304244385).

Almost surely, 2^2391761993 is an apocalyptic number.

It is an amenable number.

2391761993 is a deficient number, since it is larger than the sum of its proper divisors (42193087).

2391761993 is an equidigital number, since it uses as much as digits as its factorization.

2391761993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48187.

The product of its digits is 551124, while the sum is 50.

The square root of 2391761993 is about 48905.6437745175. The cubic root of 2391761993 is about 1337.3322570429.

The spelling of 2391761993 in words is "two billion, three hundred ninety-one million, seven hundred sixty-one thousand, nine hundred ninety-three".