261041136 has 20 divisors (see below), whose sum is σ = 674356392. Its totient is φ = 87013696.

The previous prime is 261041117. The next prime is 261041141. The reversal of 261041136 is 631140162.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2719131 + ... + 2719226.

Almost surely, 2^261041136 is an apocalyptic number.

It is an amenable number.

261041136 is an abundant number, since it is smaller than the sum of its proper divisors (413315256).

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

261041136 is a wasteful number, since it uses less digits than its factorization.

261041136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5438368 (or 5438362 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 261041136 is about 16156.7674984819. The cubic root of 261041136 is about 639.1012253891.

Adding to 261041136 its reverse (631140162), we get a palindrome (892181298).

The spelling of 261041136 in words is "two hundred sixty-one million, forty-one thousand, one hundred thirty-six".