13921801 has 2 divisors, whose sum is σ = 13921802. Its totient is φ = 13921800.

The previous prime is 13921783. The next prime is 13921811. The reversal of 13921801 is 10812931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10017225 + 3904576 = 3165^2 + 1976^2 .

It is a cyclic number.

It is not a de Polignac number, because 13921801 - 2⁹ = 13921289 is a prime.

It is not a weakly prime, because it can be changed into another prime (13921811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6960900 + 6960901.

It is an arithmetic number, because the mean of its divisors is an integer number (6960901).

Almost surely, 2^13921801 is an apocalyptic number.

It is an amenable number.

13921801 is a deficient number, since it is larger than the sum of its proper divisors (1).

13921801 is an equidigital number, since it uses as much as digits as its factorization.

13921801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 13921801 is about 3731.1929727635. The cubic root of 13921801 is about 240.5646485177.

The spelling of 13921801 in words is "thirteen million, nine hundred twenty-one thousand, eight hundred one".