1229992981520 has 80 divisors (see below), whose sum is σ = 2907038067120. Its totient is φ = 483924713472.

The previous prime is 1229992981517. The next prime is 1229992981571. The reversal of 1229992981520 is 251892999221.

It can be written as a sum of positive squares in 8 ways, for example, as 48754406416 + 1181238575104 = 220804^2 + 1086848^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 1229992981520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 679844 + ... + 1709436.

It is an arithmetic number, because the mean of its divisors is an integer number (36337975839).

Almost surely, 2^{1229992981520} is an apocalyptic number.

1229992981520 is a gapful number since it is divisible by the number (10) 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 1229992981520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1453519033560).

1229992981520 is an abundant number, since it is smaller than the sum of its proper divisors (1677045085600).

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

1229992981520 is a wasteful number, since it uses less digits than its factorization.

1229992981520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029852 (or 1029846 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 59.

The spelling of 1229992981520 in words is "one trillion, two hundred twenty-nine billion, nine hundred ninety-two million, nine hundred eighty-one thousand, five hundred twenty".