261146305 has 16 divisors (see below), whose sum is σ = 370494720. Its totient is φ = 172896192.

The previous prime is 261146297. The next prime is 261146309. The reversal of 261146305 is 503641162.

It is not a de Polignac number, because 261146305 - 2³ = 261146297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261146309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127629 + ... + 129658.

It is an arithmetic number, because the mean of its divisors is an integer number (23155920).

Almost surely, 2^261146305 is an apocalyptic number.

It is an amenable number.

261146305 is a deficient number, since it is larger than the sum of its proper divisors (109348415).

261146305 is a wasteful number, since it uses less digits than its factorization.

261146305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257328.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 261146305 is about 16160.0218131041. The cubic root of 261146305 is about 639.1870415091.

Adding to 261146305 its reverse (503641162), we get a palindrome (764787467).

The spelling of 261146305 in words is "two hundred sixty-one million, one hundred forty-six thousand, three hundred five".