91152209 has 4 divisors (see below), whose sum is σ = 92872116. Its totient is φ = 89432304.

The previous prime is 91152203. The next prime is 91152233. The reversal of 91152209 is 90225119.

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 77440000 + 13712209 = 8800^2 + 3703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91152209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91152203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 859874 + ... + 859979.

It is an arithmetic number, because the mean of its divisors is an integer number (23218029).

Almost surely, 2^91152209 is an apocalyptic number.

It is an amenable number.

91152209 is a deficient number, since it is larger than the sum of its proper divisors (1719907).

91152209 is a wasteful number, since it uses less digits than its factorization.

91152209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719906.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 91152209 is about 9547.3666002726. The cubic root of 91152209 is about 450.0447840203.

The spelling of 91152209 in words is "ninety-one million, one hundred fifty-two thousand, two hundred nine".