91605225 has 24 divisors (see below), whose sum is σ = 153944512. Its totient is φ = 48052800.

The previous prime is 91605223. The next prime is 91605233. The reversal of 91605225 is 52250619.

It is a happy number.

It is not a de Polignac number, because 91605225 - 2¹ = 91605223 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 91605192 and 91605201.

It is not an unprimeable number, because it can be changed into a prime (91605223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5437 + ... + 14586.

Almost surely, 2^91605225 is an apocalyptic number.

It is an amenable number.

91605225 is a deficient number, since it is larger than the sum of its proper divisors (62339287).

91605225 is a wasteful number, since it uses less digits than its factorization.

91605225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20097 (or 20092 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 91605225 is about 9571.0618533160. The cubic root of 91605225 is about 450.7891092552.

The spelling of 91605225 in words is "ninety-one million, six hundred five thousand, two hundred twenty-five".