18131693471 has 2 divisors, whose sum is σ = 18131693472. Its totient is φ = 18131693470.

The previous prime is 18131693443. The next prime is 18131693473. The reversal of 18131693471 is 17439613181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18131693471 - 2³⁴ = 951824287 is a prime.

It is a super-3 number, since 3×18131693471³ (a number of 32 digits) contains 333 as substring.

Together with 18131693473, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18131693473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9065846735 + 9065846736.

It is an arithmetic number, because the mean of its divisors is an integer number (9065846736).

Almost surely, 2^18131693471 is an apocalyptic number.

18131693471 is a deficient number, since it is larger than the sum of its proper divisors (1).

18131693471 is an equidigital number, since it uses as much as digits as its factorization.

18131693471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The spelling of 18131693471 in words is "eighteen billion, one hundred thirty-one million, six hundred ninety-three thousand, four hundred seventy-one".