91087369 has 2 divisors, whose sum is σ = 91087370. Its totient is φ = 91087368.

The previous prime is 91087361. The next prime is 91087417. The reversal of 91087369 is 96378019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83174400 + 7912969 = 9120^2 + 2813^2 .

It is an emirp because it is prime and its reverse (96378019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91087369 - 2³ = 91087361 is a prime.

It is a super-2 number, since 2×91087369² = 16593817582684322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91087361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45543684 + 45543685.

It is an arithmetic number, because the mean of its divisors is an integer number (45543685).

Almost surely, 2^91087369 is an apocalyptic number.

It is an amenable number.

91087369 is a deficient number, since it is larger than the sum of its proper divisors (1).

91087369 is an equidigital number, since it uses as much as digits as its factorization.

91087369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 91087369 is about 9543.9702954274. The cubic root of 91087369 is about 449.9380474383.

The spelling of 91087369 in words is "ninety-one million, eighty-seven thousand, three hundred sixty-nine".