261220301 has 2 divisors, whose sum is σ = 261220302. Its totient is φ = 261220300.

The previous prime is 261220273. The next prime is 261220319. The reversal of 261220301 is 103022162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222457225 + 38763076 = 14915^2 + 6226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261220301 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261220301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261220381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130610150 + 130610151.

It is an arithmetic number, because the mean of its divisors is an integer number (130610151).

Almost surely, 2^261220301 is an apocalyptic number.

It is an amenable number.

261220301 is a deficient number, since it is larger than the sum of its proper divisors (1).

261220301 is an equidigital number, since it uses as much as digits as its factorization.

261220301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 261220301 is about 16162.3111280534. The cubic root of 261220301 is about 639.2474071827.

Adding to 261220301 its reverse (103022162), we get a palindrome (364242463).

The spelling of 261220301 in words is "two hundred sixty-one million, two hundred twenty thousand, three hundred one".