13803991 has 2 divisors, whose sum is σ = 13803992. Its totient is φ = 13803990.

The previous prime is 13803961. The next prime is 13804019. The reversal of 13803991 is 19930831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13803991 - 2¹³ = 13795799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13803931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6901995 + 6901996.

It is an arithmetic number, because the mean of its divisors is an integer number (6901996).

Almost surely, 2^13803991 is an apocalyptic number.

13803991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13803991 is an equidigital number, since it uses as much as digits as its factorization.

13803991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 13803991 is about 3715.3722559119. The cubic root of 13803991 is about 239.8841512644.

The spelling of 13803991 in words is "thirteen million, eight hundred three thousand, nine hundred ninety-one".