1981042525 has 24 divisors (see below), whose sum is σ = 3062643264. Its totient is φ = 1234934400.

The previous prime is 1981042513. The next prime is 1981042529. The reversal of 1981042525 is 5252401891.

It is not a de Polignac number, because 1981042525 - 2⁹ = 1981042013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981042529) 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 23 ways as a sum of consecutive naturals, for example, 512632 + ... + 516481.

It is an arithmetic number, because the mean of its divisors is an integer number (127610136).

Almost surely, 2^1981042525 is an apocalyptic number.

It is an amenable number.

1981042525 is a deficient number, since it is larger than the sum of its proper divisors (1081600739).

1981042525 is a wasteful number, since it uses less digits than its factorization.

1981042525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029141 (or 1029136 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1981042525 is about 44508.9038845038. The cubic root of 1981042525 is about 1255.9275852218.

The spelling of 1981042525 in words is "one billion, nine hundred eighty-one million, forty-two thousand, five hundred twenty-five".