1231033213 has 4 divisors (see below), whose sum is σ = 1238585728. Its totient is φ = 1223480700.

The previous prime is 1231033211. The next prime is 1231033229. The reversal of 1231033213 is 3123301321.

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 1231033213 - 2¹ = 1231033211 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 (1231033211) 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, 3776013 + ... + 3776338.

It is an arithmetic number, because the mean of its divisors is an integer number (309646432).

Almost surely, 2^1231033213 is an apocalyptic number.

It is an amenable number.

1231033213 is a deficient number, since it is larger than the sum of its proper divisors (7552515).

1231033213 is an equidigital number, since it uses as much as digits as its factorization.

1231033213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7552514.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1231033213 is about 35086.0828962140. The cubic root of 1231033213 is about 1071.7411930571.

Adding to 1231033213 its reverse (3123301321), we get a palindrome (4354334534).

The spelling of 1231033213 in words is "one billion, two hundred thirty-one million, thirty-three thousand, two hundred thirteen".