13921961 has 2 divisors, whose sum is σ = 13921962. Its totient is φ = 13921960.

The previous prime is 13921949. The next prime is 13921979. The reversal of 13921961 is 16912931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13920361 + 1600 = 3731^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 13921961 - 2¹⁰ = 13920937 is a prime.

It is not a weakly prime, because it can be changed into another prime (13927961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6960980 + 6960981.

It is an arithmetic number, because the mean of its divisors is an integer number (6960981).

Almost surely, 2^13921961 is an apocalyptic number.

It is an amenable number.

13921961 is a deficient number, since it is larger than the sum of its proper divisors (1).

13921961 is an equidigital number, since it uses as much as digits as its factorization.

13921961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 32.

The square root of 13921961 is about 3731.2144135656. The cubic root of 13921961 is about 240.5655700985.

The spelling of 13921961 in words is "thirteen million, nine hundred twenty-one thousand, nine hundred sixty-one".