11812013 has 4 divisors (see below), whose sum is σ = 11874048. Its totient is φ = 11749980.

The previous prime is 11812007. The next prime is 11812037. The reversal of 11812013 is 31021811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31021811 = 3779 ⋅8209.

It is a cyclic number.

It is not a de Polignac number, because 11812013 - 2¹⁴ = 11795629 is a prime.

It is a super-2 number, since 2×11812013² = 279047302224338, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11811982 and 11812000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11812063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30731 + ... + 31112.

It is an arithmetic number, because the mean of its divisors is an integer number (2968512).

Almost surely, 2^11812013 is an apocalyptic number.

It is an amenable number.

11812013 is a deficient number, since it is larger than the sum of its proper divisors (62035).

11812013 is an equidigital number, since it uses as much as digits as its factorization.

11812013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62034.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 11812013 is about 3436.8609224116. The cubic root of 11812013 is about 227.7410430724.

Adding to 11812013 its reverse (31021811), we get a palindrome (42833824).

The spelling of 11812013 in words is "eleven million, eight hundred twelve thousand, thirteen".