261461305 has 24 divisors (see below), whose sum is σ = 373894920. Its totient is φ = 174908160.

The previous prime is 261461281. The next prime is 261461327. The reversal of 261461305 is 503164162.

It can be written as a sum of positive squares in 4 ways, for example, as 16257024 + 245204281 = 4032^2 + 15659^2 .

It is not a de Polignac number, because 261461305 - 2¹³ = 261453113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2970 + ... + 23059.

It is an arithmetic number, because the mean of its divisors is an integer number (15578955).

Almost surely, 2^261461305 is an apocalyptic number.

It is an amenable number.

261461305 is a deficient number, since it is larger than the sum of its proper divisors (112433615).

261461305 is a wasteful number, since it uses less digits than its factorization.

261461305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26089 (or 26082 counting only the distinct ones).

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

The square root of 261461305 is about 16169.7651498097. The cubic root of 261461305 is about 639.4439383946.

The spelling of 261461305 in words is "two hundred sixty-one million, four hundred sixty-one thousand, three hundred five".