18823313 has 2 divisors, whose sum is σ = 18823314. Its totient is φ = 18823312.

The previous prime is 18823303. The next prime is 18823327. The reversal of 18823313 is 31332881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12588304 + 6235009 = 3548^2 + 2497^2 .

It is a cyclic number.

It is not a de Polignac number, because 18823313 - 2⁶ = 18823249 is a prime.

It is a super-2 number, since 2×18823313² = 708634224591938, which contains 22 as substring.

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 (18823303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9411656 + 9411657.

It is an arithmetic number, because the mean of its divisors is an integer number (9411657).

Almost surely, 2^18823313 is an apocalyptic number.

It is an amenable number.

18823313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18823313 is an equidigital number, since it uses as much as digits as its factorization.

18823313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 18823313 is about 4338.5842160779. The cubic root of 18823313 is about 266.0104439339.

The spelling of 18823313 in words is "eighteen million, eight hundred twenty-three thousand, three hundred thirteen".