15813113 has 4 divisors (see below), whose sum is σ = 15822180. Its totient is φ = 15804048.

The previous prime is 15813101. The next prime is 15813143. The reversal of 15813113 is 31131851.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6492304 + 9320809 = 2548^2 + 3053^2 .

It is a cyclic number.

It is not a de Polignac number, because 15813113 - 2⁸ = 15812857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15813143) 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, 998 + ... + 5711.

It is an arithmetic number, because the mean of its divisors is an integer number (3955545).

Almost surely, 2^15813113 is an apocalyptic number.

It is an amenable number.

15813113 is a deficient number, since it is larger than the sum of its proper divisors (9067).

15813113 is an equidigital number, since it uses as much as digits as its factorization.

15813113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9066.

The product of its digits is 360, while the sum is 23.

The square root of 15813113 is about 3976.5705073593. The cubic root of 15813113 is about 250.9992698507. Note that the first 3 decimals are identical.

Adding to 15813113 its reverse (31131851), we get a palindrome (46944964).

The spelling of 15813113 in words is "fifteen million, eight hundred thirteen thousand, one hundred thirteen".