1231213326 has 16 divisors (see below), whose sum is σ = 2814201984. Its totient is φ = 351775224.

The previous prime is 1231213303. The next prime is 1231213327. The reversal of 1231213326 is 6233121321.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1231213296 and 1231213305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231213327) 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, 14657260 + ... + 14657343.

It is an arithmetic number, because the mean of its divisors is an integer number (175887624).

Almost surely, 2^1231213326 is an apocalyptic number.

1231213326 is an abundant number, since it is smaller than the sum of its proper divisors (1582988658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231213326 is a wasteful number, since it uses less digits than its factorization.

1231213326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29314615.

The product of its digits is 1296, while the sum is 24.

The square root of 1231213326 is about 35088.6495322918. The cubic root of 1231213326 is about 1071.7934594801.

Adding to 1231213326 its reverse (6233121321), we get a palindrome (7464334647).

The spelling of 1231213326 in words is "one billion, two hundred thirty-one million, two hundred thirteen thousand, three hundred twenty-six".