1812226913 has 4 divisors (see below), whose sum is σ = 2071116480. Its totient is φ = 1553337348.

The previous prime is 1812226901. The next prime is 1812226919. The reversal of 1812226913 is 3196222181.

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.

It is a cyclic number.

It is not a de Polignac number, because 1812226913 - 2¹⁰ = 1812225889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812226919) 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, 129444773 + ... + 129444786.

It is an arithmetic number, because the mean of its divisors is an integer number (517779120).

Almost surely, 2^1812226913 is an apocalyptic number.

It is an amenable number.

1812226913 is a deficient number, since it is larger than the sum of its proper divisors (258889567).

1812226913 is an equidigital number, since it uses as much as digits as its factorization.

1812226913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258889566.

The product of its digits is 10368, while the sum is 35.

The square root of 1812226913 is about 42570.2585498374. The cubic root of 1812226913 is about 1219.1885029391.

The spelling of 1812226913 in words is "one billion, eight hundred twelve million, two hundred twenty-six thousand, nine hundred thirteen".