18831523987 has 2 divisors, whose sum is σ = 18831523988. Its totient is φ = 18831523986.

The previous prime is 18831523967. The next prime is 18831523993. The reversal of 18831523987 is 78932513881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18831523987 - 2¹¹ = 18831521939 is a prime.

It is not a weakly prime, because it can be changed into another prime (18831523937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9415761993 + 9415761994.

It is an arithmetic number, because the mean of its divisors is an integer number (9415761994).

Almost surely, 2^18831523987 is an apocalyptic number.

18831523987 is a deficient number, since it is larger than the sum of its proper divisors (1).

18831523987 is an equidigital number, since it uses as much as digits as its factorization.

18831523987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 55.

The spelling of 18831523987 in words is "eighteen billion, eight hundred thirty-one million, five hundred twenty-three thousand, nine hundred eighty-seven".