261144716 has 18 divisors (see below), whose sum is σ = 531616428. Its totient is φ = 111919080.

The previous prime is 261144673. The next prime is 261144749. The reversal of 261144716 is 617441162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 665990 + ... + 666381.

It is an arithmetic number, because the mean of its divisors is an integer number (29534246).

Almost surely, 2^261144716 is an apocalyptic number.

It is an amenable number.

261144716 is an abundant number, since it is smaller than the sum of its proper divisors (270471712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261144716 is a wasteful number, since it uses less digits than its factorization.

261144716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332389 (or 1332380 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 261144716 is about 16159.9726484917. The cubic root of 261144716 is about 639.1857450835.

Adding to 261144716 its reverse (617441162), we get a palindrome (878585878).

The spelling of 261144716 in words is "two hundred sixty-one million, one hundred forty-four thousand, seven hundred sixteen".