14681921 has 2 divisors, whose sum is σ = 14681922. Its totient is φ = 14681920.

The previous prime is 14681893. The next prime is 14681923. The reversal of 14681921 is 12918641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11296321 + 3385600 = 3361^2 + 1840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-14681921 is a prime.

Together with 14681923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (14681923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7340960 + 7340961.

It is an arithmetic number, because the mean of its divisors is an integer number (7340961).

Almost surely, 2^14681921 is an apocalyptic number.

It is an amenable number.

14681921 is a deficient number, since it is larger than the sum of its proper divisors (1).

14681921 is an equidigital number, since it uses as much as digits as its factorization.

14681921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 14681921 is about 3831.6994923924. The cubic root of 14681921 is about 244.8655155306.

The spelling of 14681921 in words is "fourteen million, six hundred eighty-one thousand, nine hundred twenty-one".