2378291991 has 4 divisors (see below), whose sum is σ = 3171055992. Its totient is φ = 1585527992.

The previous prime is 2378291941. The next prime is 2378292013. The reversal of 2378291991 is 1991928732.

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

It is a cyclic number.

It is not a de Polignac number, because 2378291991 - 2¹⁷ = 2378160919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2378291911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396381996 + ... + 396382001.

It is an arithmetic number, because the mean of its divisors is an integer number (792763998).

Almost surely, 2^2378291991 is an apocalyptic number.

2378291991 is a deficient number, since it is larger than the sum of its proper divisors (792764001).

2378291991 is an equidigital number, since it uses as much as digits as its factorization.

2378291991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792764000.

The product of its digits is 489888, while the sum is 51.

The square root of 2378291991 is about 48767.7351432276. The cubic root of 2378291991 is about 1334.8169856708.

The spelling of 2378291991 in words is "two billion, three hundred seventy-eight million, two hundred ninety-one thousand, nine hundred ninety-one".