91820893 has 8 divisors (see below), whose sum is σ = 97406712. Its totient is φ = 86255616.

The previous prime is 91820891. The next prime is 91820903. The reversal of 91820893 is 39802819.

It can be written as a sum of positive squares in 4 ways, for example, as 675684 + 91145209 = 822^2 + 9547^2 .

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 91820893 - 2¹ = 91820891 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 (91820891) 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, 4621 + ... + 14317.

It is an arithmetic number, because the mean of its divisors is an integer number (12175839).

Almost surely, 2^91820893 is an apocalyptic number.

It is an amenable number.

91820893 is a deficient number, since it is larger than the sum of its proper divisors (5585819).

91820893 is a wasteful number, since it uses less digits than its factorization.

91820893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10271.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 91820893 is about 9582.3219002494. The cubic root of 91820893 is about 451.1425992407.

The spelling of 91820893 in words is "ninety-one million, eight hundred twenty thousand, eight hundred ninety-three".