18450031 has 2 divisors, whose sum is σ = 18450032. Its totient is φ = 18450030.

The previous prime is 18450011. The next prime is 18450037. The reversal of 18450031 is 13005481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18450031 - 2¹¹ = 18447983 is a prime.

It is a super-2 number, since 2×18450031² = 680807287801922, which contains 22 as substring.

It is equal to p_1178221 and since 18450031 and 1178221 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 18449984 and 18450011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18450037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9225015 + 9225016.

It is an arithmetic number, because the mean of its divisors is an integer number (9225016).

Almost surely, 2^18450031 is an apocalyptic number.

18450031 is a deficient number, since it is larger than the sum of its proper divisors (1).

18450031 is an equidigital number, since it uses as much as digits as its factorization.

18450031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18450031 is about 4295.3499275379. The cubic root of 18450031 is about 264.2402876182.

The spelling of 18450031 in words is "eighteen million, four hundred fifty thousand, thirty-one".