18393113 has 2 divisors, whose sum is σ = 18393114. Its totient is φ = 18393112.

The previous prime is 18393103. The next prime is 18393131. The reversal of 18393113 is 31139381.

Together with next prime (18393131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10259209 + 8133904 = 3203^2 + 2852^2 .

It is a cyclic number.

It is not a de Polignac number, because 18393113 - 2⁴ = 18393097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18393103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9196556 + 9196557.

It is an arithmetic number, because the mean of its divisors is an integer number (9196557).

Almost surely, 2^18393113 is an apocalyptic number.

It is an amenable number.

18393113 is a deficient number, since it is larger than the sum of its proper divisors (1).

18393113 is an equidigital number, since it uses as much as digits as its factorization.

18393113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 18393113 is about 4288.7192726967. The cubic root of 18393113 is about 263.9682822700.

The spelling of 18393113 in words is "eighteen million, three hundred ninety-three thousand, one hundred thirteen".