91318417 has 4 divisors (see below), whose sum is σ = 93041460. Its totient is φ = 89595376.

The previous prime is 91318411. The next prime is 91318421. The reversal of 91318417 is 71481319.

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 81072016 + 10246401 = 9004^2 + 3201^2 .

It is a cyclic number.

It is not a de Polignac number, because 91318417 - 2¹⁹ = 90794129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91318411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861442 + ... + 861547.

It is an arithmetic number, because the mean of its divisors is an integer number (23260365).

Almost surely, 2^91318417 is an apocalyptic number.

It is an amenable number.

91318417 is a deficient number, since it is larger than the sum of its proper divisors (1723043).

91318417 is a wasteful number, since it uses less digits than its factorization.

91318417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723042.

The product of its digits is 6048, while the sum is 34.

The square root of 91318417 is about 9556.0670257172. The cubic root of 91318417 is about 450.3181568982.

The spelling of 91318417 in words is "ninety-one million, three hundred eighteen thousand, four hundred seventeen".