1831612213 has 4 divisors (see below), whose sum is σ = 1866170988. Its totient is φ = 1797053440.

The previous prime is 1831612207. The next prime is 1831612241. The reversal of 1831612213 is 3122161381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3122161381 = 23 ⋅135746147.

It can be written as a sum of positive squares in 2 ways, for example, as 1617487524 + 214124689 = 40218^2 + 14633^2 .

It is a cyclic number.

It is not a de Polignac number, because 1831612213 - 2⁹ = 1831611701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1831612243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17279308 + ... + 17279413.

It is an arithmetic number, because the mean of its divisors is an integer number (466542747).

Almost surely, 2^1831612213 is an apocalyptic number.

It is an amenable number.

1831612213 is a deficient number, since it is larger than the sum of its proper divisors (34558775).

1831612213 is an equidigital number, since it uses as much as digits as its factorization.

1831612213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34558774.

The product of its digits is 1728, while the sum is 28.

The square root of 1831612213 is about 42797.3388541858. The cubic root of 1831612213 is about 1223.5202931464.

Adding to 1831612213 its reverse (3122161381), we get a palindrome (4953773594).

The spelling of 1831612213 in words is "one billion, eight hundred thirty-one million, six hundred twelve thousand, two hundred thirteen".