1206413261 has 2 divisors, whose sum is σ = 1206413262. Its totient is φ = 1206413260.

The previous prime is 1206413213. The next prime is 1206413269. The reversal of 1206413261 is 1623146021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 915062500 + 291350761 = 30250^2 + 17069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1206413261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1206413261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1206413269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603206630 + 603206631.

It is an arithmetic number, because the mean of its divisors is an integer number (603206631).

Almost surely, 2^1206413261 is an apocalyptic number.

It is an amenable number.

1206413261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206413261 is an equidigital number, since it uses as much as digits as its factorization.

1206413261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1206413261 is about 34733.4602508878. The cubic root of 1206413261 is about 1064.5482919126.

Adding to 1206413261 its reverse (1623146021), we get a palindrome (2829559282).

The spelling of 1206413261 in words is "one billion, two hundred six million, four hundred thirteen thousand, two hundred sixty-one".