261201313 has 2 divisors, whose sum is σ = 261201314. Its totient is φ = 261201312.

The previous prime is 261201299. The next prime is 261201349. The reversal of 261201313 is 313102162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149010849 + 112190464 = 12207^2 + 10592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261201313 is a prime.

It is a super-2 number, since 2×261201313² = 136452251825847938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261201613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130600656 + 130600657.

It is an arithmetic number, because the mean of its divisors is an integer number (130600657).

Almost surely, 2^261201313 is an apocalyptic number.

It is an amenable number.

261201313 is a deficient number, since it is larger than the sum of its proper divisors (1).

261201313 is an equidigital number, since it uses as much as digits as its factorization.

261201313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 261201313 is about 16161.7237013878. The cubic root of 261201313 is about 639.2319179272.

Adding to 261201313 its reverse (313102162), we get a palindrome (574303475).

The spelling of 261201313 in words is "two hundred sixty-one million, two hundred one thousand, three hundred thirteen".