261180281 has 2 divisors, whose sum is σ = 261180282. Its totient is φ = 261180280.

The previous prime is 261180263. The next prime is 261180287. The reversal of 261180281 is 182081162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221741881 + 39438400 = 14891^2 + 6280^2 .

It is a cyclic number.

It is not a de Polignac number, because 261180281 - 2⁶ = 261180217 is a prime.

It is a super-2 number, since 2×261180281² = 136430278366477922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (261180287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130590140 + 130590141.

It is an arithmetic number, because the mean of its divisors is an integer number (130590141).

Almost surely, 2^261180281 is an apocalyptic number.

It is an amenable number.

261180281 is a deficient number, since it is larger than the sum of its proper divisors (1).

261180281 is an equidigital number, since it uses as much as digits as its factorization.

261180281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 261180281 is about 16161.0730151188. The cubic root of 261180281 is about 639.2147604247.

The spelling of 261180281 in words is "two hundred sixty-one million, one hundred eighty thousand, two hundred eighty-one".