203969 has 2 divisors, whose sum is σ = 203970. Its totient is φ = 203968.

The previous prime is 203953. The next prime is 203971. The reversal of 203969 is 969302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169744 + 34225 = 412^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 203969 - 2⁴ = 203953 is a prime.

It is a super-2 number, since 2×203969² = 83206705922, which contains 22 as substring.

Together with 203971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (203909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101984 + 101985.

It is an arithmetic number, because the mean of its divisors is an integer number (101985).

2²⁰³⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

203969 is a deficient number, since it is larger than the sum of its proper divisors (1).

203969 is an equidigital number, since it uses as much as digits as its factorization.

203969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 203969 is about 451.6292727448. The cubic root of 203969 is about 58.8646711595.

The spelling of 203969 in words is "two hundred three thousand, nine hundred sixty-nine".