13819991 has 2 divisors, whose sum is σ = 13819992. Its totient is φ = 13819990.

The previous prime is 13819957. The next prime is 13820041. The reversal of 13819991 is 19991831.

It is a happy number.

13819991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13819991 - 2¹⁰ = 13818967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13819901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6909995 + 6909996.

It is an arithmetic number, because the mean of its divisors is an integer number (6909996).

Almost surely, 2^13819991 is an apocalyptic number.

13819991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13819991 is an equidigital number, since it uses as much as digits as its factorization.

13819991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 41.

The square root of 13819991 is about 3717.5248486056. The cubic root of 13819991 is about 239.9767975254.

The spelling of 13819991 in words is "thirteen million, eight hundred nineteen thousand, nine hundred ninety-one".