91428533 has 16 divisors (see below), whose sum is σ = 111746304. Its totient is φ = 73017600.

The previous prime is 91428529. The next prime is 91428541. The reversal of 91428533 is 33582419.

It is a cyclic number.

It is not a de Polignac number, because 91428533 - 2² = 91428529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91428493 and 91428502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91422533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8216 + ... + 15822.

It is an arithmetic number, because the mean of its divisors is an integer number (6984144).

Almost surely, 2^91428533 is an apocalyptic number.

It is an amenable number.

91428533 is a deficient number, since it is larger than the sum of its proper divisors (20317771).

91428533 is a wasteful number, since it uses less digits than its factorization.

91428533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7732.

The product of its digits is 25920, while the sum is 35.

The square root of 91428533 is about 9561.8268651968. The cubic root of 91428533 is about 450.4990890606.

The spelling of 91428533 in words is "ninety-one million, four hundred twenty-eight thousand, five hundred thirty-three".