291285 has 12 divisors (see below), whose sum is σ = 504972. Its totient is φ = 155328.

The previous prime is 291271. The next prime is 291287. The reversal of 291285 is 582192.

It can be written as a sum of positive squares in 2 ways, for example, as 77841 + 213444 = 279^2 + 462^2 .

It is not a de Polignac number, because 291285 - 2⁵ = 291253 is a prime.

291285 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3192 + ... + 3281.

It is an arithmetic number, because the mean of its divisors is an integer number (42081).

2²⁹¹²⁸⁵ is an apocalyptic number.

It is an amenable number.

291285 is a deficient number, since it is larger than the sum of its proper divisors (213687).

291285 is a wasteful number, since it uses less digits than its factorization.

291285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6484 (or 6481 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 291285 is about 539.7082545228. The cubic root of 291285 is about 66.2886803904.

It can be divided in two parts, 291 and 285, that added together give a square (576 = 24²).

The spelling of 291285 in words is "two hundred ninety-one thousand, two hundred eighty-five".