261316105 has 8 divisors (see below), whose sum is σ = 313744392. Its totient is φ = 208942848.

The previous prime is 261316103. The next prime is 261316123. The reversal of 261316105 is 501613162.

It can be written as a sum of positive squares in 4 ways, for example, as 41209 + 261274896 = 203^2 + 16164^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261316105 - 2¹ = 261316103 is a prime.

It is a super-2 number, since 2×261316105² = 136572213464742050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261316105.

It is not an unprimeable number, because it can be changed into a prime (261316103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2464 + ... + 22993.

It is an arithmetic number, because the mean of its divisors is an integer number (39218049).

Almost surely, 2^261316105 is an apocalyptic number.

It is an amenable number.

261316105 is a deficient number, since it is larger than the sum of its proper divisors (52428287).

261316105 is a wasteful number, since it uses less digits than its factorization.

261316105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27515.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 261316105 is about 16165.2746651580. The cubic root of 261316105 is about 639.3255468128.

Adding to 261316105 its reverse (501613162), we get a palindrome (762929267).

It can be divided in two parts, 26 and 1316105, that added together give a palindrome (1316131).

The spelling of 261316105 in words is "two hundred sixty-one million, three hundred sixteen thousand, one hundred five".