253909 has 2 divisors, whose sum is σ = 253910. Its totient is φ = 253908.

The previous prime is 253907. The next prime is 253919. The reversal of 253909 is 909352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253009 + 900 = 503^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 253909 - 2¹ = 253907 is a prime.

Together with 253907, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126954 + 126955.

It is an arithmetic number, because the mean of its divisors is an integer number (126955).

2²⁵³⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

253909 is a deficient number, since it is larger than the sum of its proper divisors (1).

253909 is an equidigital number, since it uses as much as digits as its factorization.

253909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 253909 is about 503.8938380254. The cubic root of 253909 is about 63.3226913483.

The spelling of 253909 in words is "two hundred fifty-three thousand, nine hundred nine".