253217 has 4 divisors (see below), whose sum is σ = 254340. Its totient is φ = 252096.

The previous prime is 253159. The next prime is 253229. The reversal of 253217 is 712352.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 92416 + 160801 = 304^2 + 401^2 .

It is a cyclic number.

It is not a de Polignac number, because 253217 - 2⁶ = 253153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 253217.

It is not an unprimeable number, because it can be changed into a prime (253247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92 + ... + 717.

It is an arithmetic number, because the mean of its divisors is an integer number (63585).

2²⁵³²¹⁷ is an apocalyptic number.

It is an amenable number.

253217 is a deficient number, since it is larger than the sum of its proper divisors (1123).

253217 is an equidigital number, since it uses as much as digits as its factorization.

253217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122.

The product of its digits is 420, while the sum is 20.

The square root of 253217 is about 503.2067169663. The cubic root of 253217 is about 63.2651127526.

Adding to 253217 its reverse (712352), we get a palindrome (965569).

The spelling of 253217 in words is "two hundred fifty-three thousand, two hundred seventeen".