18411231 has 4 divisors (see below), whose sum is σ = 24548312. Its totient is φ = 12274152.

The previous prime is 18411229. The next prime is 18411251. The reversal of 18411231 is 13211481.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18411231 - 2¹ = 18411229 is a prime.

It is a super-2 number, since 2×18411231² = 677946853870722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18411198 and 18411207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18411251) 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, 3068536 + ... + 3068541.

It is an arithmetic number, because the mean of its divisors is an integer number (6137078).

Almost surely, 2^18411231 is an apocalyptic number.

18411231 is a deficient number, since it is larger than the sum of its proper divisors (6137081).

18411231 is an equidigital number, since it uses as much as digits as its factorization.

18411231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6137080.

The product of its digits is 192, while the sum is 21.

The square root of 18411231 is about 4290.8310383887. The cubic root of 18411231 is about 264.0549271617.

The spelling of 18411231 in words is "eighteen million, four hundred eleven thousand, two hundred thirty-one".