14211991 has 2 divisors, whose sum is σ = 14211992. Its totient is φ = 14211990.

The previous prime is 14211971. The next prime is 14211997. The reversal of 14211991 is 19911241.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-14211991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (14211997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7105995 + 7105996.

It is an arithmetic number, because the mean of its divisors is an integer number (7105996).

Almost surely, 2^14211991 is an apocalyptic number.

14211991 is a deficient number, since it is larger than the sum of its proper divisors (1).

14211991 is an equidigital number, since it uses as much as digits as its factorization.

14211991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 28.

The square root of 14211991 is about 3769.8794410432. The cubic root of 14211991 is about 242.2246337595.

The spelling of 14211991 in words is "fourteen million, two hundred eleven thousand, nine hundred ninety-one".