261314636 has 18 divisors (see below), whose sum is σ = 499078188. Its totient is φ = 118730640.

The previous prime is 261314629. The next prime is 261314639. The reversal of 261314636 is 636413162.

261314636 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261314639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106010 + ... + 108446.

It is an arithmetic number, because the mean of its divisors is an integer number (27726566).

Almost surely, 2^261314636 is an apocalyptic number.

It is an amenable number.

261314636 is a deficient number, since it is larger than the sum of its proper divisors (237763552).

261314636 is an equidigital number, since it uses as much as digits as its factorization.

261314636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4889 (or 2450 counting only the distinct ones).

The product of its digits is 15552, while the sum is 32.

The square root of 261314636 is about 16165.2292281922. The cubic root of 261314636 is about 639.3243488116.

Adding to 261314636 its reverse (636413162), we get a palindrome (897727798).

The spelling of 261314636 in words is "two hundred sixty-one million, three hundred fourteen thousand, six hundred thirty-six".