13749569 has 2 divisors, whose sum is σ = 13749570. Its totient is φ = 13749568.

The previous prime is 13749557. The next prime is 13749577. The reversal of 13749569 is 96594731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13601344 + 148225 = 3688^2 + 385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13749569 is a prime.

It is a super-2 number, since 2×13749569² = 378101295371522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13749599) 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, 6874784 + 6874785.

It is an arithmetic number, because the mean of its divisors is an integer number (6874785).

Almost surely, 2^13749569 is an apocalyptic number.

It is an amenable number.

13749569 is a deficient number, since it is larger than the sum of its proper divisors (1).

13749569 is an equidigital number, since it uses as much as digits as its factorization.

13749569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 13749569 is about 3708.0411270643. The cubic root of 13749569 is about 239.5684896731.

The spelling of 13749569 in words is "thirteen million, seven hundred forty-nine thousand, five hundred sixty-nine".