91321097 has 4 divisors (see below), whose sum is σ = 104366976. Its totient is φ = 78275220.

The previous prime is 91321081. The next prime is 91321099. The reversal of 91321097 is 79012319.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 91321097 - 2⁴ = 91321081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91321099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6522929 + ... + 6522942.

It is an arithmetic number, because the mean of its divisors is an integer number (26091744).

Almost surely, 2^91321097 is an apocalyptic number.

It is an amenable number.

91321097 is a deficient number, since it is larger than the sum of its proper divisors (13045879).

91321097 is a wasteful number, since it uses less digits than its factorization.

91321097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13045878.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 91321097 is about 9556.2072497409. The cubic root of 91321097 is about 450.3225621463.

The spelling of 91321097 in words is "ninety-one million, three hundred twenty-one thousand, ninety-seven".