91072033 has 4 divisors (see below), whose sum is σ = 98077588. Its totient is φ = 84066480.

The previous prime is 91072027. The next prime is 91072049. The reversal of 91072033 is 33027019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33027019 = 2531 ⋅13049.

It can be written as a sum of positive squares in 2 ways, for example, as 60964864 + 30107169 = 7808^2 + 5487^2 .

It is a cyclic number.

It is not a de Polignac number, because 91072033 - 2²¹ = 88974881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91071989 and 91072007.

It is not an unprimeable number, because it can be changed into a prime (91072633) 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, 3502758 + ... + 3502783.

It is an arithmetic number, because the mean of its divisors is an integer number (24519397).

Almost surely, 2^91072033 is an apocalyptic number.

It is an amenable number.

91072033 is a deficient number, since it is larger than the sum of its proper divisors (7005555).

91072033 is a wasteful number, since it uses less digits than its factorization.

91072033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7005554.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 91072033 is about 9543.1668223918. The cubic root of 91072033 is about 449.9127946242.

The spelling of 91072033 in words is "ninety-one million, seventy-two thousand, thirty-three".