216725 has 6 divisors (see below), whose sum is σ = 268770. Its totient is φ = 173360.

The previous prime is 216719. The next prime is 216731. The reversal of 216725 is 527612.

It is an interprime number because it is at equal distance from previous prime (216719) and next prime (216731).

It can be written as a sum of positive squares in 3 ways, for example, as 10609 + 206116 = 103^2 + 454^2 .

It is not a de Polignac number, because 216725 - 2⁶ = 216661 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 216725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4310 + ... + 4359.

It is an arithmetic number, because the mean of its divisors is an integer number (44795).

2²¹⁶⁷²⁵ is an apocalyptic number.

216725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216725 is a deficient number, since it is larger than the sum of its proper divisors (52045).

216725 is an equidigital number, since it uses as much as digits as its factorization.

216725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8679 (or 8674 counting only the distinct ones).

The product of its digits is 840, while the sum is 23.

The square root of 216725 is about 465.5373239602. The cubic root of 216725 is about 60.0670546629.

The spelling of 216725 in words is "two hundred sixteen thousand, seven hundred twenty-five".