261004685 has 8 divisors (see below), whose sum is σ = 315672576. Its totient is φ = 207159120.

The previous prime is 261004657. The next prime is 261004699. The reversal of 261004685 is 586400162.

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

It is not a de Polignac number, because 261004685 - 2¹⁶ = 260939149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204881 + ... + 206150.

It is an arithmetic number, because the mean of its divisors is an integer number (39459072).

Almost surely, 2^261004685 is an apocalyptic number.

It is an amenable number.

261004685 is a deficient number, since it is larger than the sum of its proper divisors (54667891).

261004685 is a wasteful number, since it uses less digits than its factorization.

261004685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411163.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 261004685 is about 16155.6394178627. The cubic root of 261004685 is about 639.0714766127.

The spelling of 261004685 in words is "two hundred sixty-one million, four thousand, six hundred eighty-five".