99845569 has 2 divisors, whose sum is σ = 99845570. Its totient is φ = 99845568.

The previous prime is 99845567. The next prime is 99845591. The reversal of 99845569 is 96554899.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62489025 + 37356544 = 7905^2 + 6112^2 .

It is a cyclic number.

It is not a de Polignac number, because 99845569 - 2¹ = 99845567 is a prime.

It is a super-2 number, since 2×99845569² = 19938275297867522, which contains 22 as substring.

Together with 99845567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99845561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49922784 + 49922785.

It is an arithmetic number, because the mean of its divisors is an integer number (49922785).

Almost surely, 2^99845569 is an apocalyptic number.

It is an amenable number.

99845569 is a deficient number, since it is larger than the sum of its proper divisors (1).

99845569 is an equidigital number, since it uses as much as digits as its factorization.

99845569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3499200, while the sum is 55.

The square root of 99845569 is about 9992.2754665792. The cubic root of 99845569 is about 463.9198251907.

The spelling of 99845569 in words is "ninety-nine million, eight hundred forty-five thousand, five hundred sixty-nine".