18223531 has 8 divisors (see below), whose sum is σ = 18685584. Its totient is φ = 17767200.

The previous prime is 18223463. The next prime is 18223547. The reversal of 18223531 is 13532281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18223531 - 2⁹ = 18223019 is a prime.

It is a super-2 number, since 2×18223531² = 664194164215922, 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 = 18223496 and 18223505.

It is not an unprimeable number, because it can be changed into a prime (18223631) 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 7 ways as a sum of consecutive naturals, for example, 5421 + ... + 8113.

It is an arithmetic number, because the mean of its divisors is an integer number (2335698).

Almost surely, 2^18223531 is an apocalyptic number.

18223531 is a deficient number, since it is larger than the sum of its proper divisors (462053).

18223531 is a wasteful number, since it uses less digits than its factorization.

18223531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861.

The product of its digits is 1440, while the sum is 25.

The square root of 18223531 is about 4268.9027864312. The cubic root of 18223531 is about 263.1545256614.

The spelling of 18223531 in words is "eighteen million, two hundred twenty-three thousand, five hundred thirty-one".