18140371521431 has 2 divisors, whose sum is σ = 18140371521432. Its totient is φ = 18140371521430.

The previous prime is 18140371521421. The next prime is 18140371521439. The reversal of 18140371521431 is 13412517304181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18140371521431 - 2²² = 18140367327127 is a prime.

It is a super-2 number, since 2×18140371521431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18140371521439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070185760715 + 9070185760716.

It is an arithmetic number, because the mean of its divisors is an integer number (9070185760716).

Almost surely, 2^{18140371521431} is an apocalyptic number.

18140371521431 is a deficient number, since it is larger than the sum of its proper divisors (1).

18140371521431 is an equidigital number, since it uses as much as digits as its factorization.

18140371521431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 18140371521431 in words is "eighteen trillion, one hundred forty billion, three hundred seventy-one million, five hundred twenty-one thousand, four hundred thirty-one".