13997569 has 2 divisors, whose sum is σ = 13997570. Its totient is φ = 13997568.

The previous prime is 13997567. The next prime is 13997611. The reversal of 13997569 is 96579931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13965169 + 32400 = 3737^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 13997569 - 2¹ = 13997567 is a prime.

It is a super-2 number, since 2×13997569² = 391863875819522, which contains 22 as substring.

Together with 13997567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13997561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6998784 + 6998785.

It is an arithmetic number, because the mean of its divisors is an integer number (6998785).

Almost surely, 2^13997569 is an apocalyptic number.

It is an amenable number.

13997569 is a deficient number, since it is larger than the sum of its proper divisors (1).

13997569 is an equidigital number, since it uses as much as digits as its factorization.

13997569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 459270, while the sum is 49.

The square root of 13997569 is about 3741.3325166309. The cubic root of 13997569 is about 241.0002754770. Note that the first 3 decimals are identical.

The spelling of 13997569 in words is "thirteen million, nine hundred ninety-seven thousand, five hundred sixty-nine".