18975569 has 2 divisors, whose sum is σ = 18975570. Its totient is φ = 18975568.

The previous prime is 18975557. The next prime is 18975571. The reversal of 18975569 is 96557981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11135569 + 7840000 = 3337^2 + 2800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18975569 is a prime.

It is a super-2 number, since 2×18975569² = 720144437747522, which contains 22 as substring.

Together with 18975571, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18975269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9487784 + 9487785.

It is an arithmetic number, because the mean of its divisors is an integer number (9487785).

Almost surely, 2^18975569 is an apocalyptic number.

It is an amenable number.

18975569 is a deficient number, since it is larger than the sum of its proper divisors (1).

18975569 is an equidigital number, since it uses as much as digits as its factorization.

18975569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 50.

The square root of 18975569 is about 4356.0956141940. The cubic root of 18975569 is about 266.7257443762.

The spelling of 18975569 in words is "eighteen million, nine hundred seventy-five thousand, five hundred sixty-nine".