261631712 has 12 divisors (see below), whose sum is σ = 515087496. Its totient is φ = 130815840.

The previous prime is 261631709. The next prime is 261631753. The reversal of 261631712 is 217136162.

261631712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4087964 + ... + 4088027.

It is an arithmetic number, because the mean of its divisors is an integer number (42923958).

Almost surely, 2^261631712 is an apocalyptic number.

It is an amenable number.

261631712 is a deficient number, since it is larger than the sum of its proper divisors (253455784).

261631712 is an equidigital number, since it uses as much as digits as its factorization.

261631712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8176001 (or 8175993 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 261631712 is about 16175.0336012016. The cubic root of 261631712 is about 639.5828270905.

Adding to 261631712 its reverse (217136162), we get a palindrome (478767874).

The spelling of 261631712 in words is "two hundred sixty-one million, six hundred thirty-one thousand, seven hundred twelve".