253609 has 2 divisors, whose sum is σ = 253610. Its totient is φ = 253608.

The previous prime is 253607. The next prime is 253613. The reversal of 253609 is 906352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205209 + 48400 = 453^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 253609 - 2¹ = 253607 is a prime.

Together with 253607, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126804 + 126805.

It is an arithmetic number, because the mean of its divisors is an integer number (126805).

2²⁵³⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

253609 is a deficient number, since it is larger than the sum of its proper divisors (1).

253609 is an equidigital number, since it uses as much as digits as its factorization.

253609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 253609 is about 503.5960682928. The cubic root of 253609 is about 63.2977423914.

The spelling of 253609 in words is "two hundred fifty-three thousand, six hundred nine".