205101261 has 8 divisors (see below), whose sum is σ = 303853760. Its totient is φ = 136734156.

The previous prime is 205101251. The next prime is 205101307. The reversal of 205101261 is 162101502.

205101261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205101261 - 2⁷ = 205101133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205101241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3798145 + ... + 3798198.

It is an arithmetic number, because the mean of its divisors is an integer number (37981720).

Almost surely, 2^205101261 is an apocalyptic number.

It is an amenable number.

205101261 is a deficient number, since it is larger than the sum of its proper divisors (98752499).

205101261 is an equidigital number, since it uses as much as digits as its factorization.

205101261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7596352 (or 7596346 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 205101261 is about 14321.3568142128. The cubic root of 205101261 is about 589.7339229227.

Adding to 205101261 its reverse (162101502), we get a palindrome (367202763).

The spelling of 205101261 in words is "two hundred five million, one hundred one thousand, two hundred sixty-one".