261180685 has 4 divisors (see below), whose sum is σ = 313416828. Its totient is φ = 208944544.

The previous prime is 261180679. The next prime is 261180691. The reversal of 261180685 is 586081162.

261180685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (261180679) and next prime (261180691).

It can be written as a sum of positive squares in 2 ways, for example, as 126945289 + 134235396 = 11267^2 + 11586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261180685 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26118064 + ... + 26118073.

It is an arithmetic number, because the mean of its divisors is an integer number (78354207).

Almost surely, 2^261180685 is an apocalyptic number.

It is an amenable number.

261180685 is a deficient number, since it is larger than the sum of its proper divisors (52236143).

261180685 is an equidigital number, since it uses as much as digits as its factorization.

261180685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52236142.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 261180685 is about 16161.0855142840. The cubic root of 261180685 is about 639.2150900089.

The spelling of 261180685 in words is "two hundred sixty-one million, one hundred eighty thousand, six hundred eighty-five".