18408787131 has 8 divisors (see below), whose sum is σ = 28051485184. Its totient is φ = 10519306920.

The previous prime is 18408787129. The next prime is 18408787141. The reversal of 18408787131 is 13178780481.

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

It is not a de Polignac number, because 18408787131 - 2¹ = 18408787129 is a prime.

It is a super-2 number, since 2×18408787131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18408787141) 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, 438304435 + ... + 438304476.

It is an arithmetic number, because the mean of its divisors is an integer number (3506435648).

Almost surely, 2^18408787131 is an apocalyptic number.

18408787131 is a deficient number, since it is larger than the sum of its proper divisors (9642698053).

18408787131 is an equidigital number, since it uses as much as digits as its factorization.

18408787131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876608921.

The product of its (nonzero) digits is 301056, while the sum is 48.

The spelling of 18408787131 in words is "eighteen billion, four hundred eight million, seven hundred eighty-seven thousand, one hundred thirty-one".