13991933 has 2 divisors, whose sum is σ = 13991934. Its totient is φ = 13991932.

The previous prime is 13991911. The next prime is 13991953. The reversal of 13991933 is 33919931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13935289 + 56644 = 3733^2 + 238^2 .

It is a cyclic number.

It is not a de Polignac number, because 13991933 - 2⁶ = 13991869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13991953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6995966 + 6995967.

It is an arithmetic number, because the mean of its divisors is an integer number (6995967).

Almost surely, 2^13991933 is an apocalyptic number.

It is an amenable number.

13991933 is a deficient number, since it is larger than the sum of its proper divisors (1).

13991933 is an equidigital number, since it uses as much as digits as its factorization.

13991933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19683, while the sum is 38.

The square root of 13991933 is about 3740.5792332204. The cubic root of 13991933 is about 240.9679255765.

The spelling of 13991933 in words is "thirteen million, nine hundred ninety-one thousand, nine hundred thirty-three".