1316820013 has 4 divisors (see below), whose sum is σ = 1317433788. Its totient is φ = 1316206240.

The previous prime is 1316820007. The next prime is 1316820041. The reversal of 1316820013 is 3100286131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3100286131 = 709 ⋅4372759.

It can be written as a sum of positive squares in 2 ways, for example, as 229007689 + 1087812324 = 15133^2 + 32982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1316820013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1316820013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316820053) 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, 303658 + ... + 307963.

It is an arithmetic number, because the mean of its divisors is an integer number (329358447).

Almost surely, 2^1316820013 is an apocalyptic number.

It is an amenable number.

1316820013 is a deficient number, since it is larger than the sum of its proper divisors (613775).

1316820013 is an equidigital number, since it uses as much as digits as its factorization.

1316820013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613774.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1316820013 is about 36288.0147293841. The cubic root of 1316820013 is about 1096.0797125877.

The spelling of 1316820013 in words is "one billion, three hundred sixteen million, eight hundred twenty thousand, thirteen".