261260761 has 4 divisors (see below), whose sum is σ = 261493300. Its totient is φ = 261028224.

The previous prime is 261260731. The next prime is 261260771. The reversal of 261260761 is 167062162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15555136 + 245705625 = 3944^2 + 15675^2 .

It is a cyclic number.

It is not a de Polignac number, because 261260761 - 2⁹ = 261260249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261260731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114576 + ... + 116833.

It is an arithmetic number, because the mean of its divisors is an integer number (65373325).

Almost surely, 2^261260761 is an apocalyptic number.

It is an amenable number.

261260761 is a deficient number, since it is larger than the sum of its proper divisors (232539).

261260761 is a wasteful number, since it uses less digits than its factorization.

261260761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232538.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 261260761 is about 16163.5627570162. The cubic root of 261260761 is about 639.2804094860.

The spelling of 261260761 in words is "two hundred sixty-one million, two hundred sixty thousand, seven hundred sixty-one".