18464531 has 2 divisors, whose sum is σ = 18464532. Its totient is φ = 18464530.

The previous prime is 18464519. The next prime is 18464549. The reversal of 18464531 is 13546481.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18464531 is a prime.

It is a super-2 number, since 2×18464531² = 681877810099922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1179095 and since 18464531 and 1179095 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18464231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9232265 + 9232266.

It is an arithmetic number, because the mean of its divisors is an integer number (9232266).

Almost surely, 2^18464531 is an apocalyptic number.

18464531 is a deficient number, since it is larger than the sum of its proper divisors (1).

18464531 is an equidigital number, since it uses as much as digits as its factorization.

18464531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 18464531 is about 4297.0374678376. The cubic root of 18464531 is about 264.3094922152.

The spelling of 18464531 in words is "eighteen million, four hundred sixty-four thousand, five hundred thirty-one".