18610913 has 2 divisors, whose sum is σ = 18610914. Its totient is φ = 18610912.

The previous prime is 18610909. The next prime is 18610931. The reversal of 18610913 is 31901681.

It is a happy number.

Together with next prime (18610931) 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., 9778129 + 8832784 = 3127^2 + 2972^2 .

It is a cyclic number.

It is not a de Polignac number, because 18610913 - 2² = 18610909 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_1187804 and since 18610913 and 1187804 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 (18610993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9305456 + 9305457.

It is an arithmetic number, because the mean of its divisors is an integer number (9305457).

Almost surely, 2^18610913 is an apocalyptic number.

It is an amenable number.

18610913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18610913 is an equidigital number, since it uses as much as digits as its factorization.

18610913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 18610913 is about 4314.0367406873. The cubic root of 18610913 is about 265.0061135412.

The spelling of 18610913 in words is "eighteen million, six hundred ten thousand, nine hundred thirteen".