18194413 has 2 divisors, whose sum is σ = 18194414. Its totient is φ = 18194412.

The previous prime is 18194399. The next prime is 18194431. The reversal of 18194413 is 31449181.

Together with next prime (18194431) 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., 15382084 + 2812329 = 3922^2 + 1677^2 .

It is a cyclic number.

It is not a de Polignac number, because 18194413 - 2¹⁷ = 18063341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18194213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9097206 + 9097207.

It is an arithmetic number, because the mean of its divisors is an integer number (9097207).

Almost surely, 2^18194413 is an apocalyptic number.

It is an amenable number.

18194413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18194413 is an equidigital number, since it uses as much as digits as its factorization.

18194413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 18194413 is about 4265.4909447800. The cubic root of 18194413 is about 263.0142927170.

The spelling of 18194413 in words is "eighteen million, one hundred ninety-four thousand, four hundred thirteen".