91669289 has 2 divisors, whose sum is σ = 91669290. Its totient is φ = 91669288.

The previous prime is 91669247. The next prime is 91669337. The reversal of 91669289 is 98296619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47844889 + 43824400 = 6917^2 + 6620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91669289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91669229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45834644 + 45834645.

It is an arithmetic number, because the mean of its divisors is an integer number (45834645).

Almost surely, 2^91669289 is an apocalyptic number.

It is an amenable number.

91669289 is a deficient number, since it is larger than the sum of its proper divisors (1).

91669289 is an equidigital number, since it uses as much as digits as its factorization.

91669289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 50.

The square root of 91669289 is about 9574.4080234759. The cubic root of 91669289 is about 450.8941710347.

The spelling of 91669289 in words is "ninety-one million, six hundred sixty-nine thousand, two hundred eighty-nine".