205205961 has 4 divisors (see below), whose sum is σ = 273607952. Its totient is φ = 136803972.

The previous prime is 205205941. The next prime is 205205969. The reversal of 205205961 is 169502502.

It is a happy number.

205205961 is digitally balanced in base 2, 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 not a de Polignac number, because 205205961 - 2¹⁵ = 205173193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205205969) 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, 34200991 + ... + 34200996.

It is an arithmetic number, because the mean of its divisors is an integer number (68401988).

Almost surely, 2^205205961 is an apocalyptic number.

It is an amenable number.

205205961 is a deficient number, since it is larger than the sum of its proper divisors (68401991).

205205961 is an equidigital number, since it uses as much as digits as its factorization.

205205961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68401990.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 205205961 is about 14325.0117277439. The cubic root of 205205961 is about 589.8342548885.

The spelling of 205205961 in words is "two hundred five million, two hundred five thousand, nine hundred sixty-one".