1331123213 has 4 divisors (see below), whose sum is σ = 1521283680. Its totient is φ = 1140962748.

The previous prime is 1331123197. The next prime is 1331123221. The reversal of 1331123213 is 3123211331.

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 1331123213 - 2⁴ = 1331123197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331123263) 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, 95080223 + ... + 95080236.

It is an arithmetic number, because the mean of its divisors is an integer number (380320920).

Almost surely, 2^1331123213 is an apocalyptic number.

It is an amenable number.

1331123213 is a deficient number, since it is larger than the sum of its proper divisors (190160467).

1331123213 is an equidigital number, since it uses as much as digits as its factorization.

1331123213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190160466.

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

The square root of 1331123213 is about 36484.5612965265. The cubic root of 1331123213 is about 1100.0339419279.

Adding to 1331123213 its reverse (3123211331), we get a palindrome (4454334544).

The spelling of 1331123213 in words is "one billion, three hundred thirty-one million, one hundred twenty-three thousand, two hundred thirteen".