9131285 has 4 divisors (see below), whose sum is σ = 10957548. Its totient is φ = 7305024.

The previous prime is 9131279. The next prime is 9131293. The reversal of 9131285 is 5821319.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5821319 = 7 ⋅831617.

It can be written as a sum of positive squares in 2 ways, for example, as 3928324 + 5202961 = 1982^2 + 2281^2 .

It is a cyclic number.

It is not a de Polignac number, because 9131285 - 2¹² = 9127189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913124 + ... + 913133.

It is an arithmetic number, because the mean of its divisors is an integer number (2739387).

Almost surely, 2^9131285 is an apocalyptic number.

It is an amenable number.

9131285 is a deficient number, since it is larger than the sum of its proper divisors (1826263).

9131285 is a wasteful number, since it uses less digits than its factorization.

9131285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826262.

The product of its digits is 2160, while the sum is 29.

The square root of 9131285 is about 3021.8016149311. The cubic root of 9131285 is about 209.0149253323.

The spelling of 9131285 in words is "nine million, one hundred thirty-one thousand, two hundred eighty-five".