18081214531 has 4 divisors (see below), whose sum is σ = 18083980312. Its totient is φ = 18078448752.

The previous prime is 18081214483. The next prime is 18081214561. The reversal of 18081214531 is 13541218081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13541218081 = 47 ⋅288111023.

It is a cyclic number.

It is not a de Polignac number, because 18081214531 - 2¹¹ = 18081212483 is a prime.

It is a super-2 number, since 2×18081214531² (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 (18081214561) 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, 1373061 + ... + 1386166.

It is an arithmetic number, because the mean of its divisors is an integer number (4520995078).

Almost surely, 2^18081214531 is an apocalyptic number.

18081214531 is a deficient number, since it is larger than the sum of its proper divisors (2765781).

18081214531 is an equidigital number, since it uses as much as digits as its factorization.

18081214531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765780.

The product of its (nonzero) digits is 7680, while the sum is 34.

The spelling of 18081214531 in words is "eighteen billion, eighty-one million, two hundred fourteen thousand, five hundred thirty-one".