18249031 has 2 divisors, whose sum is σ = 18249032. Its totient is φ = 18249030.

The previous prime is 18249017. The next prime is 18249043. The reversal of 18249031 is 13094281.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13094281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18249031 - 2⁷ = 18248903 is a prime.

It is a super-2 number, since 2×18249031² = 666054264877922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18249131) 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, 9124515 + 9124516.

It is an arithmetic number, because the mean of its divisors is an integer number (9124516).

Almost surely, 2^18249031 is an apocalyptic number.

18249031 is a deficient number, since it is larger than the sum of its proper divisors (1).

18249031 is an equidigital number, since it uses as much as digits as its factorization.

18249031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 18249031 is about 4271.8884582817. Note that the first 3 decimals coincide. The cubic root of 18249031 is about 263.2772115976.

The spelling of 18249031 in words is "eighteen million, two hundred forty-nine thousand, thirty-one".