261310120 has 32 divisors (see below), whose sum is σ = 592588800. Its totient is φ = 103699008.

The previous prime is 261310109. The next prime is 261310121. The reversal of 261310120 is 21013162.

261310120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261310094 and 261310103.

It is not an unprimeable number, because it can be changed into a prime (261310121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20640 + ... + 30799.

It is an arithmetic number, because the mean of its divisors is an integer number (18518400).

Almost surely, 2^261310120 is an apocalyptic number.

261310120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261310120 is an abundant number, since it is smaller than the sum of its proper divisors (331278680).

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

261310120 is a wasteful number, since it uses less digits than its factorization.

261310120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51577 (or 51573 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 261310120 is about 16165.0895450659. The cubic root of 261310120 is about 639.3206658882.

Adding to 261310120 its reverse (21013162), we get a palindrome (282323282).

The spelling of 261310120 in words is "two hundred sixty-one million, three hundred ten thousand, one hundred twenty".