91093213 has 8 divisors (see below), whose sum is σ = 93298176. Its totient is φ = 88914000.

The previous prime is 91093207. The next prime is 91093229. The reversal of 91093213 is 31239019.

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 91093213 - 2⁵ = 91093181 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 (91093243) 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, 820 + ... + 13522.

It is an arithmetic number, because the mean of its divisors is an integer number (11662272).

Almost surely, 2^91093213 is an apocalyptic number.

It is an amenable number.

91093213 is a deficient number, since it is larger than the sum of its proper divisors (2204963).

91093213 is a wasteful number, since it uses less digits than its factorization.

91093213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12875.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 91093213 is about 9544.2764524085. The cubic root of 91093213 is about 449.9476696349.

The spelling of 91093213 in words is "ninety-one million, ninety-three thousand, two hundred thirteen".