91085293 has 4 divisors (see below), whose sum is σ = 98091868. Its totient is φ = 84078720.

The previous prime is 91085273. The next prime is 91085299. The reversal of 91085293 is 39258019.

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 8311689 + 82773604 = 2883^2 + 9098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91085293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91085299) 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, 3503268 + ... + 3503293.

It is an arithmetic number, because the mean of its divisors is an integer number (24522967).

Almost surely, 2^91085293 is an apocalyptic number.

It is an amenable number.

91085293 is a deficient number, since it is larger than the sum of its proper divisors (7006575).

91085293 is a wasteful number, since it uses less digits than its factorization.

91085293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006574.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 91085293 is about 9543.8615350392. The cubic root of 91085293 is about 449.9346291873.

It can be divided in two parts, 91085 and 293, that added together give a triangular number (91378 = T₄₂₇).

The spelling of 91085293 in words is "ninety-one million, eighty-five thousand, two hundred ninety-three".