261135516 has 24 divisors (see below), whose sum is σ = 611588880. Its totient is φ = 86720512.

The previous prime is 261135509. The next prime is 261135541. The reversal of 261135516 is 615531162.

261135516 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 in 7 ways as a sum of consecutive naturals, for example, 37221 + ... + 43676.

It is an arithmetic number, because the mean of its divisors is an integer number (25482870).

Almost surely, 2^261135516 is an apocalyptic number.

It is an amenable number.

261135516 is an abundant number, since it is smaller than the sum of its proper divisors (350453364).

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

261135516 is a wasteful number, since it uses less digits than its factorization.

261135516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81173 (or 81171 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 261135516 is about 16159.6879920375. The cubic root of 261135516 is about 639.1782389288.

Adding to 261135516 its reverse (615531162), we get a palindrome (876666678).

The spelling of 261135516 in words is "two hundred sixty-one million, one hundred thirty-five thousand, five hundred sixteen".