261143124 has 48 divisors (see below), whose sum is σ = 669014976. Its totient is φ = 78624000.

The previous prime is 261143117. The next prime is 261143147. The reversal of 261143124 is 421341162.

261143124 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 261143094 and 261143103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14424 + ... + 27024.

It is an arithmetic number, because the mean of its divisors is an integer number (13937812).

Almost surely, 2^261143124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261143124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334507488).

261143124 is an abundant number, since it is smaller than the sum of its proper divisors (407871852).

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

261143124 is a wasteful number, since it uses less digits than its factorization.

261143124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12776 (or 12774 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 261143124 is about 16159.9233909075. The cubic root of 261143124 is about 639.1844462050.

Adding to 261143124 its reverse (421341162), we get a palindrome (682484286).

The spelling of 261143124 in words is "two hundred sixty-one million, one hundred forty-three thousand, one hundred twenty-four".