91050005 has 8 divisors (see below), whose sum is σ = 109459512. Its totient is φ = 72707008.

The previous prime is 91049953. The next prime is 91050017. The reversal of 91050005 is 50005019.

It can be written as a sum of positive squares in 4 ways, for example, as 5098564 + 85951441 = 2258^2 + 9271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91050005 - 2¹⁰ = 91048981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13562 + ... + 19131.

It is an arithmetic number, because the mean of its divisors is an integer number (13682439).

Almost surely, 2^91050005 is an apocalyptic number.

It is an amenable number.

91050005 is a deficient number, since it is larger than the sum of its proper divisors (18409507).

91050005 is a wasteful number, since it uses less digits than its factorization.

91050005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33255.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 91050005 is about 9542.0126283714. The cubic root of 91050005 is about 449.8765175592.

The spelling of 91050005 in words is "ninety-one million, fifty thousand, five".