1231330013 has 4 divisors (see below), whose sum is σ = 1271050368. Its totient is φ = 1191609660.

The previous prime is 1231330007. The next prime is 1231330019. The reversal of 1231330013 is 3100331321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3100331321 = 311 ⋅9968911.

It is an interprime number because it is at equal distance from previous prime (1231330007) and next prime (1231330019).

It is a cyclic number.

It is not a de Polignac number, because 1231330013 - 2¹² = 1231325917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1231329973 and 1231330000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231330019) 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, 19860131 + ... + 19860192.

It is an arithmetic number, because the mean of its divisors is an integer number (317762592).

Almost surely, 2^1231330013 is an apocalyptic number.

It is an amenable number.

1231330013 is a deficient number, since it is larger than the sum of its proper divisors (39720355).

1231330013 is an equidigital number, since it uses as much as digits as its factorization.

1231330013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39720354.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 1231330013 is about 35090.3122385652. The cubic root of 1231330013 is about 1071.8273177915.

Adding to 1231330013 its reverse (3100331321), we get a palindrome (4331661334).

The spelling of 1231330013 in words is "one billion, two hundred thirty-one million, three hundred thirty thousand, thirteen".