91033081 has 4 divisors (see below), whose sum is σ = 93969664. Its totient is φ = 88096500.

The previous prime is 91033073. The next prime is 91033087. The reversal of 91033081 is 18033019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18033019 = 2551 ⋅7069.

It is a cyclic number.

It is not a de Polignac number, because 91033081 - 2³ = 91033073 is a prime.

It is a super-2 number, since 2×91033081² = 16574043672705122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91033087) 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, 1468245 + ... + 1468306.

It is an arithmetic number, because the mean of its divisors is an integer number (23492416).

Almost surely, 2^91033081 is an apocalyptic number.

It is an amenable number.

91033081 is a deficient number, since it is larger than the sum of its proper divisors (2936583).

91033081 is a wasteful number, since it uses less digits than its factorization.

91033081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936582.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 91033081 is about 9541.1257721508. The cubic root of 91033081 is about 449.8486421005.

The spelling of 91033081 in words is "ninety-one million, thirty-three thousand, eighty-one".