89991169 has 2 divisors, whose sum is σ = 89991170. Its totient is φ = 89991168.

The previous prime is 89991137. The next prime is 89991197. The reversal of 89991169 is 96119998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84860944 + 5130225 = 9212^2 + 2265^2 .

It is a cyclic number.

It is not a de Polignac number, because 89991169 - 2⁵ = 89991137 is a prime.

It is a super-2 number, since 2×89991169² = 16196820995973122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (89997169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44995584 + 44995585.

It is an arithmetic number, because the mean of its divisors is an integer number (44995585).

Almost surely, 2^89991169 is an apocalyptic number.

It is an amenable number.

89991169 is a deficient number, since it is larger than the sum of its proper divisors (1).

89991169 is an equidigital number, since it uses as much as digits as its factorization.

89991169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 52.

The square root of 89991169 is about 9486.3675345203. The cubic root of 89991169 is about 448.1258166632.

The spelling of 89991169 in words is "eighty-nine million, nine hundred ninety-one thousand, one hundred sixty-nine".