291625 has 8 divisors (see below), whose sum is σ = 364104. Its totient is φ = 233200.

The previous prime is 291619. The next prime is 291647. The reversal of 291625 is 526192.

It can be written as a sum of positive squares in 4 ways, for example, as 24336 + 267289 = 156^2 + 517^2 .

It is not a de Polignac number, because 291625 - 2⁹ = 291113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 291625.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1042 + ... + 1291.

It is an arithmetic number, because the mean of its divisors is an integer number (45513).

2²⁹¹⁶²⁵ is an apocalyptic number.

291625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

291625 is a deficient number, since it is larger than the sum of its proper divisors (72479).

291625 is an equidigital number, since it uses as much as digits as its factorization.

291625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348 (or 2338 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 291625 is about 540.0231476520. The cubic root of 291625 is about 66.3144619993.

Subtracting from 291625 its sum of digits (25), we obtain a square (291600 = 540²).

It can be divided in two parts, 2916 and 25, that multiplied together give a square (72900 = 270²).

The spelling of 291625 in words is "two hundred ninety-one thousand, six hundred twenty-five".