5231994091 has 4 divisors (see below), whose sum is σ = 5232823992. Its totient is φ = 5231164192.

The previous prime is 5231994073. The next prime is 5231994113. The reversal of 5231994091 is 1904991325.

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 5231994091 - 2⁹ = 5231993579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5231994011) 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, 405421 + ... + 418126.

It is an arithmetic number, because the mean of its divisors is an integer number (1308205998).

Almost surely, 2^5231994091 is an apocalyptic number.

5231994091 is a deficient number, since it is larger than the sum of its proper divisors (829901).

5231994091 is an equidigital number, since it uses as much as digits as its factorization.

5231994091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829900.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 5231994091 is about 72332.5244340331. The cubic root of 5231994091 is about 1736.0240935578.

The spelling of 5231994091 in words is "five billion, two hundred thirty-one million, nine hundred ninety-four thousand, ninety-one".