261143536 has 10 divisors (see below), whose sum is σ = 505965632. Its totient is φ = 130571760.

The previous prime is 261143513. The next prime is 261143549. The reversal of 261143536 is 635341162.

It is a junction number, because it is equal to n+sod(n) for n = 261143498 and 261143507.

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, 8160720 + ... + 8160751.

Almost surely, 2^261143536 is an apocalyptic number.

It is an amenable number.

261143536 is a deficient number, since it is larger than the sum of its proper divisors (244822096).

261143536 is a wasteful number, since it uses less digits than its factorization.

261143536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16321479 (or 16321473 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 261143536 is about 16159.9361384877. The cubic root of 261143536 is about 639.1847823474.

Adding to 261143536 its reverse (635341162), we get a palindrome (896484698).

The spelling of 261143536 in words is "two hundred sixty-one million, one hundred forty-three thousand, five hundred thirty-six".