91065021 has 8 divisors (see below), whose sum is σ = 121942080. Its totient is φ = 60448992.

The previous prime is 91065001. The next prime is 91065053. The reversal of 91065021 is 12056019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91065021 - 2⁵ = 91064989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91064982 and 91065000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91065001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64441 + ... + 65838.

It is an arithmetic number, because the mean of its divisors is an integer number (15242760).

Almost surely, 2^91065021 is an apocalyptic number.

It is an amenable number.

91065021 is a deficient number, since it is larger than the sum of its proper divisors (30877059).

91065021 is a wasteful number, since it uses less digits than its factorization.

91065021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130515.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 91065021 is about 9542.7994320325. The cubic root of 91065021 is about 449.9012474661.

The spelling of 91065021 in words is "ninety-one million, sixty-five thousand, twenty-one".