13919813 has 2 divisors, whose sum is σ = 13919814. Its totient is φ = 13919812.

The previous prime is 13919803. The next prime is 13919819. The reversal of 13919813 is 31891931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13667809 + 252004 = 3697^2 + 502^2 .

It is a cyclic number.

It is not a de Polignac number, because 13919813 - 2⁶ = 13919749 is a prime.

It is a super-2 number, since 2×13919813² = 387522387909938, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13919819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6959906 + 6959907.

It is an arithmetic number, because the mean of its divisors is an integer number (6959907).

Almost surely, 2^13919813 is an apocalyptic number.

It is an amenable number.

13919813 is a deficient number, since it is larger than the sum of its proper divisors (1).

13919813 is an equidigital number, since it uses as much as digits as its factorization.

13919813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 35.

The square root of 13919813 is about 3730.9265605209. The cubic root of 13919813 is about 240.5531972864.

The spelling of 13919813 in words is "thirteen million, nine hundred nineteen thousand, eight hundred thirteen".