18828971331 has 4 divisors (see below), whose sum is σ = 25105295112. Its totient is φ = 12552647552.

The previous prime is 18828971269. The next prime is 18828971347. The reversal of 18828971331 is 13317982881.

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 18828971331 - 2¹¹ = 18828969283 is a prime.

It is a super-2 number, since 2×18828971331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18828971351) 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, 3138161886 + ... + 3138161891.

It is an arithmetic number, because the mean of its divisors is an integer number (6276323778).

Almost surely, 2^18828971331 is an apocalyptic number.

18828971331 is a deficient number, since it is larger than the sum of its proper divisors (6276323781).

18828971331 is an equidigital number, since it uses as much as digits as its factorization.

18828971331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6276323780.

The product of its digits is 580608, while the sum is 51.

The spelling of 18828971331 in words is "eighteen billion, eight hundred twenty-eight million, nine hundred seventy-one thousand, three hundred thirty-one".