261518713 has 2 divisors, whose sum is σ = 261518714. Its totient is φ = 261518712.

The previous prime is 261518681. The next prime is 261518729. The reversal of 261518713 is 317815162.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248472169 + 13046544 = 15763^2 + 3612^2 .

It is a cyclic number.

It is not a de Polignac number, because 261518713 - 2⁵ = 261518681 is a prime.

It is not a weakly prime, because it can be changed into another prime (261518743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130759356 + 130759357.

It is an arithmetic number, because the mean of its divisors is an integer number (130759357).

Almost surely, 2^261518713 is an apocalyptic number.

It is an amenable number.

261518713 is a deficient number, since it is larger than the sum of its proper divisors (1).

261518713 is an equidigital number, since it uses as much as digits as its factorization.

261518713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

The square root of 261518713 is about 16171.5402173077. The cubic root of 261518713 is about 639.4907350085.

The spelling of 261518713 in words is "two hundred sixty-one million, five hundred eighteen thousand, seven hundred thirteen".