91065621 has 8 divisors (see below), whose sum is σ = 124702624. Its totient is φ = 59069520.

The previous prime is 91065593. The next prime is 91065641. The reversal of 91065621 is 12656019.

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

It is not a de Polignac number, because 91065621 - 2⁵ = 91065589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91065641) 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, 410095 + ... + 410316.

It is an arithmetic number, because the mean of its divisors is an integer number (15587828).

Almost surely, 2^91065621 is an apocalyptic number.

It is an amenable number.

91065621 is a deficient number, since it is larger than the sum of its proper divisors (33637003).

91065621 is a wasteful number, since it uses less digits than its factorization.

91065621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820451.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 91065621 is about 9542.8308692966. The cubic root of 91065621 is about 449.9022355519.

The spelling of 91065621 in words is "ninety-one million, sixty-five thousand, six hundred twenty-one".