1331979012 has 192 divisors, whose sum is σ = 4273615360. Its totient is φ = 349360128.

The previous prime is 1331978971. The next prime is 1331979029. The reversal of 1331979012 is 2109791331.

It is a happy number.

It is a super-2 number, since 2×1331979012² = 3548336176816992288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3075948 + ... + 3076380.

Almost surely, 2^1331979012 is an apocalyptic number.

1331979012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1331979012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2136807680).

1331979012 is an abundant number, since it is smaller than the sum of its proper divisors (2941636348).

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

1331979012 is a wasteful number, since it uses less digits than its factorization.

1331979012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 1331979012 is about 36496.2876468279. The cubic root of 1331979012 is about 1100.2696341768.

It can be divided in two parts, 13 and 31979012, that added together give a square (31979025 = 5655²).

The spelling of 1331979012 in words is "one billion, three hundred thirty-one million, nine hundred seventy-nine thousand, twelve".