985780261 has 4 divisors (see below), whose sum is σ = 1009823724. Its totient is φ = 961736800.

The previous prime is 985780219. The next prime is 985780321. The reversal of 985780261 is 162087589.

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 222308100 + 763472161 = 14910^2 + 27631^2 .

It is a cyclic number.

It is not a de Polignac number, because 985780261 - 2⁹ = 985779749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985780561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12021670 + ... + 12021751.

It is an arithmetic number, because the mean of its divisors is an integer number (252455931).

Almost surely, 2^985780261 is an apocalyptic number.

It is an amenable number.

985780261 is a deficient number, since it is larger than the sum of its proper divisors (24043463).

985780261 is a wasteful number, since it uses less digits than its factorization.

985780261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24043462.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 985780261 is about 31397.1377835624. The cubic root of 985780261 is about 995.2374410402.

The spelling of 985780261 in words is "nine hundred eighty-five million, seven hundred eighty thousand, two hundred sixty-one".