1231513326 has 12 divisors (see below), whose sum is σ = 2668278912. Its totient is φ = 410504436.

The previous prime is 1231513279. The next prime is 1231513331. The reversal of 1231513326 is 6233151321.

1231513326 is a `hidden beast` number, since 12 + 315 + 1 + 332 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1231513326.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34208686 + ... + 34208721.

It is an arithmetic number, because the mean of its divisors is an integer number (222356576).

Almost surely, 2^1231513326 is an apocalyptic number.

1231513326 is an abundant number, since it is smaller than the sum of its proper divisors (1436765586).

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

1231513326 is a wasteful number, since it uses less digits than its factorization.

1231513326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68417415 (or 68417412 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 1231513326 is about 35092.9241585822. The cubic root of 1231513326 is about 1071.8805042185.

Adding to 1231513326 its reverse (6233151321), we get a palindrome (7464664647).

The spelling of 1231513326 in words is "one billion, two hundred thirty-one million, five hundred thirteen thousand, three hundred twenty-six".