2013315581 has 2 divisors, whose sum is σ = 2013315582. Its totient is φ = 2013315580.

The previous prime is 2013315541. The next prime is 2013315589. The reversal of 2013315581 is 1855133102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1804975225 + 208340356 = 42485^2 + 14434^2 .

It is a cyclic number.

It is not a de Polignac number, because 2013315581 - 2¹⁸ = 2013053437 is a prime.

It is a super-2 number, since 2×2013315581² = 8106879257394735122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2013315589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006657790 + 1006657791.

It is an arithmetic number, because the mean of its divisors is an integer number (1006657791).

Almost surely, 2^2013315581 is an apocalyptic number.

It is an amenable number.

2013315581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2013315581 is an equidigital number, since it uses as much as digits as its factorization.

2013315581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 2013315581 is about 44869.9853019811. The cubic root of 2013315581 is about 1262.7109642687.

Adding to 2013315581 its reverse (1855133102), we get a palindrome (3868448683).

The spelling of 2013315581 in words is "two billion, thirteen million, three hundred fifteen thousand, five hundred eighty-one".