1981142052 has 12 divisors (see below), whose sum is σ = 4622664816. Its totient is φ = 660380680.

The previous prime is 1981142041. The next prime is 1981142057. The reversal of 1981142052 is 2502411891.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1981142057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82547574 + ... + 82547597.

It is an arithmetic number, because the mean of its divisors is an integer number (385222068).

Almost surely, 2^1981142052 is an apocalyptic number.

1981142052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1981142052 is an abundant number, since it is smaller than the sum of its proper divisors (2641522764).

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

1981142052 is a wasteful number, since it uses less digits than its factorization.

1981142052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165095178 (or 165095176 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 1981142052 is about 44510.0219276513. The cubic root of 1981142052 is about 1255.9486173484.

The spelling of 1981142052 in words is "one billion, nine hundred eighty-one million, one hundred forty-two thousand, fifty-two".