91605097 has 4 divisors (see below), whose sum is σ = 91764436. Its totient is φ = 91445760.

The previous prime is 91605091. The next prime is 91605109. The reversal of 91605097 is 79050619.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53523856 + 38081241 = 7316^2 + 6171^2 .

It is a cyclic number.

It is not a de Polignac number, because 91605097 - 2³ = 91605089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91605091) 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, 78804 + ... + 79957.

It is an arithmetic number, because the mean of its divisors is an integer number (22941109).

Almost surely, 2^91605097 is an apocalyptic number.

It is an amenable number.

91605097 is a deficient number, since it is larger than the sum of its proper divisors (159339).

91605097 is a wasteful number, since it uses less digits than its factorization.

91605097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159338.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 91605097 is about 9571.0551664903. The cubic root of 91605097 is about 450.7888992925.

The spelling of 91605097 in words is "ninety-one million, six hundred five thousand, ninety-seven".