15812113 has 4 divisors (see below), whose sum is σ = 15852340. Its totient is φ = 15771888.

The previous prime is 15812051. The next prime is 15812117. The reversal of 15812113 is 31121851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31121851 = 59 ⋅527489.

It can be written as a sum of positive squares in 2 ways, for example, as 13046544 + 2765569 = 3612^2 + 1663^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15812113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15812117) 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, 19518 + ... + 20311.

It is an arithmetic number, because the mean of its divisors is an integer number (3963085).

Almost surely, 2^15812113 is an apocalyptic number.

It is an amenable number.

15812113 is a deficient number, since it is larger than the sum of its proper divisors (40227).

15812113 is an equidigital number, since it uses as much as digits as its factorization.

15812113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40226.

The product of its digits is 240, while the sum is 22.

The square root of 15812113 is about 3976.4447688859. Note that the first 3 decimals coincide. The cubic root of 15812113 is about 250.9939787871.

Adding to 15812113 its reverse (31121851), we get a palindrome (46933964).

The spelling of 15812113 in words is "fifteen million, eight hundred twelve thousand, one hundred thirteen".