18231413 has 4 divisors (see below), whose sum is σ = 18540480. Its totient is φ = 17922348.

The previous prime is 18231403. The next prime is 18231419. The reversal of 18231413 is 31413281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18231413 - 2⁴ = 18231397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18231419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154445 + ... + 154562.

It is an arithmetic number, because the mean of its divisors is an integer number (4635120).

Almost surely, 2^18231413 is an apocalyptic number.

It is an amenable number.

18231413 is a deficient number, since it is larger than the sum of its proper divisors (309067).

18231413 is an equidigital number, since it uses as much as digits as its factorization.

18231413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309066.

The product of its digits is 576, while the sum is 23.

The square root of 18231413 is about 4269.8258746698. The cubic root of 18231413 is about 263.1924598577.

Adding to 18231413 its reverse (31413281), we get a palindrome (49644694).

The spelling of 18231413 in words is "eighteen million, two hundred thirty-one thousand, four hundred thirteen".