203961 has 4 divisors (see below), whose sum is σ = 271952. Its totient is φ = 135972.

The previous prime is 203953. The next prime is 203969. The reversal of 203961 is 169302.

203961 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (203953) and next prime (203969).

It is not a de Polignac number, because 203961 - 2³ = 203953 is a prime.

It is a D-number.

It is a Duffinian number.

203961 is strictly pandigital in base 7.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (203969) 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, 33991 + ... + 33996.

It is an arithmetic number, because the mean of its divisors is an integer number (67988).

2²⁰³⁹⁶¹ is an apocalyptic number.

It is an amenable number.

203961 is a deficient number, since it is larger than the sum of its proper divisors (67991).

203961 is an equidigital number, since it uses as much as digits as its factorization.

203961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67990.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 203961 is about 451.6204158361. The cubic root of 203961 is about 58.8639015597.

The spelling of 203961 in words is "two hundred three thousand, nine hundred sixty-one".