13697641 has 2 divisors, whose sum is σ = 13697642. Its totient is φ = 13697640.

The previous prime is 13697639. The next prime is 13697653. The reversal of 13697641 is 14679631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13213225 + 484416 = 3635^2 + 696^2 .

It is a cyclic number.

It is not a de Polignac number, because 13697641 - 2¹ = 13697639 is a prime.

Together with 13697639, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 13697641.

It is not a weakly prime, because it can be changed into another prime (13697041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6848820 + 6848821.

It is an arithmetic number, because the mean of its divisors is an integer number (6848821).

Almost surely, 2^13697641 is an apocalyptic number.

It is an amenable number.

13697641 is a deficient number, since it is larger than the sum of its proper divisors (1).

13697641 is an equidigital number, since it uses as much as digits as its factorization.

13697641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 13697641 is about 3701.0324235273. The cubic root of 13697641 is about 239.2665164116.

The spelling of 13697641 in words is "thirteen million, six hundred ninety-seven thousand, six hundred forty-one".