91049281 has 4 divisors (see below), whose sum is σ = 91660500. Its totient is φ = 90438064.

The previous prime is 91049279. The next prime is 91049291. The reversal of 91049281 is 18294019.

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 41473600 + 49575681 = 6440^2 + 7041^2 .

It is a cyclic number.

It is not a de Polignac number, because 91049281 - 2¹ = 91049279 is a prime.

It is a super-2 number, since 2×91049281² = 16579943141233922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91049261) 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 in 3 ways as a sum of consecutive naturals, for example, 305386 + ... + 305683.

It is an arithmetic number, because the mean of its divisors is an integer number (22915125).

Almost surely, 2^91049281 is an apocalyptic number.

It is an amenable number.

91049281 is a deficient number, since it is larger than the sum of its proper divisors (611219).

91049281 is a wasteful number, since it uses less digits than its factorization.

91049281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611218.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 91049281 is about 9541.9746908069. The cubic root of 91049281 is about 449.8753251321.

The spelling of 91049281 in words is "ninety-one million, forty-nine thousand, two hundred eighty-one".