18424453231 has 4 divisors (see below), whose sum is σ = 19018790464. Its totient is φ = 17830116000.

The previous prime is 18424453193. The next prime is 18424453247. The reversal of 18424453231 is 13235442481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13235442481 = 55609 ⋅238009.

It is a cyclic number.

It is not a de Polignac number, because 18424453231 - 2²¹ = 18422356079 is a prime.

It is a super-2 number, since 2×18424453231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18424453031) 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, 297168570 + ... + 297168631.

It is an arithmetic number, because the mean of its divisors is an integer number (4754697616).

Almost surely, 2^18424453231 is an apocalyptic number.

18424453231 is a deficient number, since it is larger than the sum of its proper divisors (594337233).

18424453231 is an equidigital number, since it uses as much as digits as its factorization.

18424453231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594337232.

The product of its digits is 92160, while the sum is 37.

The spelling of 18424453231 in words is "eighteen billion, four hundred twenty-four million, four hundred fifty-three thousand, two hundred thirty-one".