13969621 has 2 divisors, whose sum is σ = 13969622. Its totient is φ = 13969620.

The previous prime is 13969603. The next prime is 13969667. The reversal of 13969621 is 12696931.

13969621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8328996 + 5640625 = 2886^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 13969621 - 2⁷ = 13969493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13969691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6984810 + 6984811.

It is an arithmetic number, because the mean of its divisors is an integer number (6984811).

Almost surely, 2^13969621 is an apocalyptic number.

It is an amenable number.

13969621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13969621 is an equidigital number, since it uses as much as digits as its factorization.

13969621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 37.

The square root of 13969621 is about 3737.5956175060. The cubic root of 13969621 is about 240.8397722869.

The spelling of 13969621 in words is "thirteen million, nine hundred sixty-nine thousand, six hundred twenty-one".