1231516768 has 48 divisors (see below), whose sum is σ = 2563686720. Its totient is φ = 580715136.

The previous prime is 1231516747. The next prime is 1231516777. The reversal of 1231516768 is 8676151321.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231516768.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133555 + ... + 142477.

It is an arithmetic number, because the mean of its divisors is an integer number (53410140).

Almost surely, 2^1231516768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231516768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1281843360).

1231516768 is an abundant number, since it is smaller than the sum of its proper divisors (1332169952).

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

1231516768 is a wasteful number, since it uses less digits than its factorization.

1231516768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9179 (or 9171 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 1231516768 is about 35092.9731997732. The cubic root of 1231516768 is about 1071.8815028298.

The spelling of 1231516768 in words is "one billion, two hundred thirty-one million, five hundred sixteen thousand, seven hundred sixty-eight".