261504316 has 12 divisors (see below), whose sum is σ = 465135160. Its totient is φ = 128608560.

The previous prime is 261504311. The next prime is 261504317. The reversal of 261504316 is 613405162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261504311) by changing a digit.

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, 535626 + ... + 536113.

Almost surely, 2^261504316 is an apocalyptic number.

It is an amenable number.

261504316 is a deficient number, since it is larger than the sum of its proper divisors (203630844).

261504316 is a wasteful number, since it uses less digits than its factorization.

261504316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071804 (or 1071802 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 261504316 is about 16171.0950773286. The cubic root of 261504316 is about 639.4789998164.

Adding to 261504316 its reverse (613405162), we get a palindrome (874909478).

The spelling of 261504316 in words is "two hundred sixty-one million, five hundred four thousand, three hundred sixteen".