261244276 has 6 divisors (see below), whose sum is σ = 457177490. Its totient is φ = 130622136.

The previous prime is 261244213. The next prime is 261244289. The reversal of 261244276 is 672442162.

261244276 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 165791376 + 95452900 = 12876^2 + 9770^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32655531 + ... + 32655538.

Almost surely, 2^261244276 is an apocalyptic number.

It is an amenable number.

261244276 is a deficient number, since it is larger than the sum of its proper divisors (195933214).

261244276 is a wasteful number, since it uses less digits than its factorization.

261244276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65311073 (or 65311071 counting only the distinct ones).

The product of its digits is 32256, while the sum is 34.

The square root of 261244276 is about 16163.0528057047. The cubic root of 261244276 is about 639.2669634572.

The spelling of 261244276 in words is "two hundred sixty-one million, two hundred forty-four thousand, two hundred seventy-six".