1959975981 has 16 divisors (see below), whose sum is σ = 3029915520. Its totient is φ = 1249839360.

The previous prime is 1959975967. The next prime is 1959976001. The reversal of 1959975981 is 1895799591.

It is not a de Polignac number, because 1959975981 - 2¹¹ = 1959973933 is a prime.

It is a super-2 number, since 2×1959975981² = 7683011692193824722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1959975481) 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 15 ways as a sum of consecutive naturals, for example, 1577460 + ... + 1578701.

It is an arithmetic number, because the mean of its divisors is an integer number (189369720).

Almost surely, 2^1959975981 is an apocalyptic number.

It is an amenable number.

1959975981 is a deficient number, since it is larger than the sum of its proper divisors (1069939539).

1959975981 is a wasteful number, since it uses less digits than its factorization.

1959975981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3156193 (or 3156187 counting only the distinct ones).

The product of its digits is 9185400, while the sum is 63.

The square root of 1959975981 is about 44271.6159745722. The cubic root of 1959975981 is about 1251.4598370503.

The spelling of 1959975981 in words is "one billion, nine hundred fifty-nine million, nine hundred seventy-five thousand, nine hundred eighty-one".