89871569 has 2 divisors, whose sum is σ = 89871570. Its totient is φ = 89871568.

The previous prime is 89871563. The next prime is 89871581. The reversal of 89871569 is 96517898.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84419344 + 5452225 = 9188^2 + 2335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89871569 is a prime.

It is a super-2 number, since 2×89871569² = 16153797829043522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 89871569.

It is not a weakly prime, because it can be changed into another prime (89871563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44935784 + 44935785.

It is an arithmetic number, because the mean of its divisors is an integer number (44935785).

Almost surely, 2^89871569 is an apocalyptic number.

It is an amenable number.

89871569 is a deficient number, since it is larger than the sum of its proper divisors (1).

89871569 is an equidigital number, since it uses as much as digits as its factorization.

89871569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 53.

The square root of 89871569 is about 9480.0616559176. The cubic root of 89871569 is about 447.9272060324.

The spelling of 89871569 in words is "eighty-nine million, eight hundred seventy-one thousand, five hundred sixty-nine".