261168281 has 16 divisors (see below), whose sum is σ = 302227200. Its totient is φ = 223189200.

The previous prime is 261168269. The next prime is 261168293. The reversal of 261168281 is 182861162.

261168281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261168269) and next prime (261168293).

It is not a de Polignac number, because 261168281 - 2¹⁴ = 261151897 is a prime.

It is a super-2 number, since 2×261168281² = 136417742000989922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261168221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22610 + ... + 32148.

It is an arithmetic number, because the mean of its divisors is an integer number (18889200).

Almost surely, 2^261168281 is an apocalyptic number.

It is an amenable number.

261168281 is a deficient number, since it is larger than the sum of its proper divisors (41058919).

261168281 is a wasteful number, since it uses less digits than its factorization.

261168281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9700.

The product of its digits is 9216, while the sum is 35.

The square root of 261168281 is about 16160.7017483771. The cubic root of 261168281 is about 639.2049706420.

The spelling of 261168281 in words is "two hundred sixty-one million, one hundred sixty-eight thousand, two hundred eighty-one".