18471231 has 48 divisors (see below), whose sum is σ = 30663360. Its totient is φ = 10644480.

The previous prime is 18471199. The next prime is 18471241. The reversal of 18471231 is 13217481.

It is not a de Polignac number, because 18471231 - 2⁵ = 18471199 is a prime.

It is a super-2 number, since 2×18471231² = 682372749310722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18471195 and 18471204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18471241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101961 + ... + 102141.

It is an arithmetic number, because the mean of its divisors is an integer number (638820).

Almost surely, 2^18471231 is an apocalyptic number.

18471231 is a deficient number, since it is larger than the sum of its proper divisors (12192129).

18471231 is a wasteful number, since it uses less digits than its factorization.

18471231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 253 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 18471231 is about 4297.8170040149. The cubic root of 18471231 is about 264.3414572739.

The spelling of 18471231 in words is "eighteen million, four hundred seventy-one thousand, two hundred thirty-one".