91068521 has 8 divisors (see below), whose sum is σ = 91904904. Its totient is φ = 90236160.

The previous prime is 91068511. The next prime is 91068529. The reversal of 91068521 is 12586019.

It can be written as a sum of positive squares in 4 ways, for example, as 1860496 + 89208025 = 1364^2 + 9445^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 91068521 - 2⁶ = 91068457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91068529) 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, 60251 + ... + 61743.

It is an arithmetic number, because the mean of its divisors is an integer number (11488113).

Almost surely, 2^91068521 is an apocalyptic number.

It is an amenable number.

91068521 is a deficient number, since it is larger than the sum of its proper divisors (836383).

91068521 is a wasteful number, since it uses less digits than its factorization.

91068521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 91068521 is about 9542.9828146130. The cubic root of 91068521 is about 449.9070112386.

The spelling of 91068521 in words is "ninety-one million, sixty-eight thousand, five hundred twenty-one".