261484785 has 12 divisors (see below), whose sum is σ = 453240372. Its totient is φ = 139458528.

The previous prime is 261484771. The next prime is 261484801. The reversal of 261484785 is 587484162.

It can be written as a sum of positive squares in 2 ways, for example, as 99380961 + 162103824 = 9969^2 + 12732^2 .

It is not a de Polignac number, because 261484785 - 2⁵ = 261484753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 5810773 = 261484785 / (2 + 6 + 1 + 4 + 8 + 4 + 7 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 261484785.

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 11 ways as a sum of consecutive naturals, for example, 2905342 + ... + 2905431.

It is an arithmetic number, because the mean of its divisors is an integer number (37770031).

Almost surely, 2^261484785 is an apocalyptic number.

It is an amenable number.

261484785 is a deficient number, since it is larger than the sum of its proper divisors (191755587).

261484785 is a wasteful number, since it uses less digits than its factorization.

261484785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5810784 (or 5810781 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 261484785 is about 16170.4911799240. The cubic root of 261484785 is about 639.4630791418.

The spelling of 261484785 in words is "two hundred sixty-one million, four hundred eighty-four thousand, seven hundred eighty-five".