1306120561213 has 4 divisors (see below), whose sum is σ = 1406591373628. Its totient is φ = 1205649748800.

The previous prime is 1306120561183. The next prime is 1306120561309. The reversal of 1306120561213 is 3121650216031.

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 410801519844 + 895319041369 = 640938^2 + 946213^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306120561213 - 2¹⁷ = 1306120430141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306120565213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50235406188 + ... + 50235406213.

It is an arithmetic number, because the mean of its divisors is an integer number (351647843407).

Almost surely, 2^{1306120561213} is an apocalyptic number.

1306120561213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1306120561213 is a deficient number, since it is larger than the sum of its proper divisors (100470812415).

1306120561213 is a wasteful number, since it uses less digits than its factorization.

1306120561213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100470812414.

The product of its (nonzero) digits is 6480, while the sum is 31.

Adding to 1306120561213 its reverse (3121650216031), we get a palindrome (4427770777244).

The spelling of 1306120561213 in words is "one trillion, three hundred six billion, one hundred twenty million, five hundred sixty-one thousand, two hundred thirteen".