261376685 has 8 divisors (see below), whose sum is σ = 316886136. Its totient is φ = 206945280.

The previous prime is 261376679. The next prime is 261376697. The reversal of 261376685 is 586673162.

It can be written as a sum of positive squares in 4 ways, for example, as 26030404 + 235346281 = 5102^2 + 15341^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261376685 - 2⁸ = 261376429 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 7 ways as a sum of consecutive naturals, for example, 268976 + ... + 269945.

It is an arithmetic number, because the mean of its divisors is an integer number (39610767).

Almost surely, 2^261376685 is an apocalyptic number.

It is an amenable number.

261376685 is a deficient number, since it is larger than the sum of its proper divisors (55509451).

261376685 is an equidigital number, since it uses as much as digits as its factorization.

261376685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539023.

The product of its digits is 362880, while the sum is 44.

The square root of 261376685 is about 16167.1483261582. The cubic root of 261376685 is about 639.3749471985.

The spelling of 261376685 in words is "two hundred sixty-one million, three hundred seventy-six thousand, six hundred eighty-five".