91228033 has 4 divisors (see below), whose sum is σ = 98245588. Its totient is φ = 84210480.

The previous prime is 91228031. The next prime is 91228043. The reversal of 91228033 is 33082219.

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 21455424 + 69772609 = 4632^2 + 8353^2 .

It is a cyclic number.

It is not a de Polignac number, because 91228033 - 2¹ = 91228031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91227992 and 91228010.

It is not an unprimeable number, because it can be changed into a prime (91228031) 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, 3508758 + ... + 3508783.

It is an arithmetic number, because the mean of its divisors is an integer number (24561397).

Almost surely, 2^91228033 is an apocalyptic number.

It is an amenable number.

91228033 is a deficient number, since it is larger than the sum of its proper divisors (7017555).

91228033 is a wasteful number, since it uses less digits than its factorization.

91228033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7017554.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 91228033 is about 9551.3367127329. The cubic root of 91228033 is about 450.1695377646.

The spelling of 91228033 in words is "ninety-one million, two hundred twenty-eight thousand, thirty-three".