1261205201 has 2 divisors, whose sum is σ = 1261205202. Its totient is φ = 1261205200.

The previous prime is 1261205189. The next prime is 1261205213. The reversal of 1261205201 is 1025021621.

It is a balanced prime because it is at equal distance from previous prime (1261205189) and next prime (1261205213).

It can be written as a sum of positive squares in only one way, i.e., 1106227600 + 154977601 = 33260^2 + 12449^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261205201 - 2⁶ = 1261205137 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261205291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630602600 + 630602601.

It is an arithmetic number, because the mean of its divisors is an integer number (630602601).

Almost surely, 2^1261205201 is an apocalyptic number.

It is an amenable number.

1261205201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261205201 is an equidigital number, since it uses as much as digits as its factorization.

1261205201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1261205201 is about 35513.4509869148. The cubic root of 1261205201 is about 1080.4265578987.

Adding to 1261205201 its reverse (1025021621), we get a palindrome (2286226822).

The spelling of 1261205201 in words is "one billion, two hundred sixty-one million, two hundred five thousand, two hundred one".