1306861285 has 4 divisors (see below), whose sum is σ = 1568233548. Its totient is φ = 1045489024.

The previous prime is 1306861271. The next prime is 1306861313. The reversal of 1306861285 is 5821686031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 604717281 + 702144004 = 24591^2 + 26498^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306861285 - 2¹¹ = 1306859237 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130686124 + ... + 130686133.

It is an arithmetic number, because the mean of its divisors is an integer number (392058387).

Almost surely, 2^1306861285 is an apocalyptic number.

It is an amenable number.

1306861285 is a deficient number, since it is larger than the sum of its proper divisors (261372263).

1306861285 is an equidigital number, since it uses as much as digits as its factorization.

1306861285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261372262.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 1306861285 is about 36150.5364413863. The cubic root of 1306861285 is about 1093.3096066035.

The spelling of 1306861285 in words is "one billion, three hundred six million, eight hundred sixty-one thousand, two hundred eighty-five".