1231334213 has 4 divisors (see below), whose sum is σ = 1254566988. Its totient is φ = 1208101440.

The previous prime is 1231334179. The next prime is 1231334231. The reversal of 1231334213 is 3124331321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3124331321 = 2473 ⋅1263377.

It can be written as a sum of positive squares in 2 ways, for example, as 1070729284 + 160604929 = 32722^2 + 12673^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231334213 - 2⁶ = 1231334149 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 (1231334243) 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, 11616308 + ... + 11616413.

It is an arithmetic number, because the mean of its divisors is an integer number (313641747).

Almost surely, 2^1231334213 is an apocalyptic number.

It is an amenable number.

1231334213 is a deficient number, since it is larger than the sum of its proper divisors (23232775).

1231334213 is an equidigital number, since it uses as much as digits as its factorization.

1231334213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23232774.

The product of its digits is 1296, while the sum is 23.

The square root of 1231334213 is about 35090.3720840917. The cubic root of 1231334213 is about 1071.8285364384.

Adding to 1231334213 its reverse (3124331321), we get a palindrome (4355665534).

The spelling of 1231334213 in words is "one billion, two hundred thirty-one million, three hundred thirty-four thousand, two hundred thirteen".