261454205 has 8 divisors (see below), whose sum is σ = 315371832. Its totient is φ = 208078848.

The previous prime is 261454201. The next prime is 261454211. The reversal of 261454205 is 502454162.

It can be written as a sum of positive squares in 4 ways, for example, as 1503076 + 259951129 = 1226^2 + 16123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261454205 - 2² = 261454201 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 (261454201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134504 + ... + 136433.

It is an arithmetic number, because the mean of its divisors is an integer number (39421479).

Almost surely, 2^261454205 is an apocalyptic number.

It is an amenable number.

261454205 is a deficient number, since it is larger than the sum of its proper divisors (53917627).

261454205 is a wasteful number, since it uses less digits than its factorization.

261454205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271135.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 261454205 is about 16169.5456027682. The cubic root of 261454205 is about 639.4381502939.

The spelling of 261454205 in words is "two hundred sixty-one million, four hundred fifty-four thousand, two hundred five".