91091417 has 4 divisors (see below), whose sum is σ = 91117236. Its totient is φ = 91065600.

The previous prime is 91091401. The next prime is 91091461. The reversal of 91091417 is 71419019.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81288256 + 9803161 = 9016^2 + 3131^2 .

It is a cyclic number.

It is not a de Polignac number, because 91091417 - 2⁴ = 91091401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91091617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6584 + ... + 15017.

It is an arithmetic number, because the mean of its divisors is an integer number (22779309).

Almost surely, 2^91091417 is an apocalyptic number.

It is an amenable number.

91091417 is a deficient number, since it is larger than the sum of its proper divisors (25819).

91091417 is a wasteful number, since it uses less digits than its factorization.

91091417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25818.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 91091417 is about 9544.1823641420. The cubic root of 91091417 is about 449.9447125492.

The spelling of 91091417 in words is "ninety-one million, ninety-one thousand, four hundred seventeen".