1231213133 has 8 divisors (see below), whose sum is σ = 1236663936. Its totient is φ = 1225775200.

The previous prime is 1231213127. The next prime is 1231213141. The reversal of 1231213133 is 3313121321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231213133 - 2²² = 1227018829 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 (1231213103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221810 + ... + 227292.

It is an arithmetic number, because the mean of its divisors is an integer number (154582992).

Almost surely, 2^1231213133 is an apocalyptic number.

It is an amenable number.

1231213133 is a deficient number, since it is larger than the sum of its proper divisors (5450803).

1231213133 is an equidigital number, since it uses as much as digits as its factorization.

1231213133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435.

The product of its digits is 324, while the sum is 20.

The square root of 1231213133 is about 35088.6467821146. The cubic root of 1231213133 is about 1071.7934034768.

Adding to 1231213133 its reverse (3313121321), we get a palindrome (4544334454).

The spelling of 1231213133 in words is "one billion, two hundred thirty-one million, two hundred thirteen thousand, one hundred thirty-three".