91215093 has 4 divisors (see below), whose sum is σ = 121620128. Its totient is φ = 60810060.

The previous prime is 91215053. The next prime is 91215097. The reversal of 91215093 is 39051219.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 91215093 - 2¹⁰ = 91214069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91215093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91215097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15202513 + ... + 15202518.

It is an arithmetic number, because the mean of its divisors is an integer number (30405032).

Almost surely, 2^91215093 is an apocalyptic number.

It is an amenable number.

91215093 is a deficient number, since it is larger than the sum of its proper divisors (30405035).

91215093 is a wasteful number, since it uses less digits than its factorization.

91215093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30405034.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 91215093 is about 9550.6592966140. The cubic root of 91215093 is about 450.1482523875.

The spelling of 91215093 in words is "ninety-one million, two hundred fifteen thousand, ninety-three".