14781391 has 2 divisors, whose sum is σ = 14781392. Its totient is φ = 14781390.

The previous prime is 14781383. The next prime is 14781397. The reversal of 14781391 is 19318741.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 14781391 - 2³ = 14781383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (14781397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7390695 + 7390696.

It is an arithmetic number, because the mean of its divisors is an integer number (7390696).

Almost surely, 2^14781391 is an apocalyptic number.

14781391 is a deficient number, since it is larger than the sum of its proper divisors (1).

14781391 is an equidigital number, since it uses as much as digits as its factorization.

14781391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 14781391 is about 3844.6574619854. The cubic root of 14781391 is about 245.4172592529.

The spelling of 14781391 in words is "fourteen million, seven hundred eighty-one thousand, three hundred ninety-one".