1981528912 has 40 divisors (see below), whose sum is σ = 4222890432. Its totient is φ = 900685280.

The previous prime is 1981528909. The next prime is 1981528919. The reversal of 1981528912 is 2198251891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981528919) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 25228 + ... + 67819.

Almost surely, 2^1981528912 is an apocalyptic number.

It is an amenable number.

1981528912 is an abundant number, since it is smaller than the sum of its proper divisors (2241361520).

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

1981528912 is an equidigital number, since it uses as much as digits as its factorization.

1981528912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93088 (or 93060 counting only the distinct ones).

The product of its digits is 103680, while the sum is 46.

The square root of 1981528912 is about 44514.3674783771. The cubic root of 1981528912 is about 1256.0303622287.

The spelling of 1981528912 in words is "one billion, nine hundred eighty-one million, five hundred twenty-eight thousand, nine hundred twelve".