19324813 has 2 divisors, whose sum is σ = 19324814. Its totient is φ = 19324812.

The previous prime is 19324783. The next prime is 19324847. The reversal of 19324813 is 31842391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14002564 + 5322249 = 3742^2 + 2307^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19324813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19324213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9662406 + 9662407.

It is an arithmetic number, because the mean of its divisors is an integer number (9662407).

Almost surely, 2^19324813 is an apocalyptic number.

It is an amenable number.

19324813 is a deficient number, since it is larger than the sum of its proper divisors (1).

19324813 is an equidigital number, since it uses as much as digits as its factorization.

19324813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 19324813 is about 4395.9996587807. Note that the first 3 decimals coincide. The cubic root of 19324813 is about 268.3521629041.

The spelling of 19324813 in words is "nineteen million, three hundred twenty-four thousand, eight hundred thirteen".