291225 has 24 divisors (see below), whose sum is σ = 526752. Its totient is φ = 140800.

The previous prime is 291217. The next prime is 291253. The reversal of 291225 is 522192.

It is not a de Polignac number, because 291225 - 2³ = 291217 is a prime.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 649 + ... + 1001.

It is an arithmetic number, because the mean of its divisors is an integer number (21948).

2²⁹¹²²⁵ is an apocalyptic number.

291225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

291225 is a deficient number, since it is larger than the sum of its proper divisors (235527).

291225 is a wasteful number, since it uses less digits than its factorization.

291225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 372 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 291225 is about 539.6526660733. The cubic root of 291225 is about 66.2841286124.

The spelling of 291225 in words is "two hundred ninety-one thousand, two hundred twenty-five".