32009999999981 has 2 divisors, whose sum is σ = 32009999999982. Its totient is φ = 32009999999980.

The previous prime is 32009999999951. The next prime is 32010000000019. The reversal of 32009999999981 is 18999999990023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23155007161225 + 8854992838756 = 4811965^2 + 2975734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32009999999981 is a prime.

It is a super-2 number, since 2×32009999999981² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 32009999999893 and 32009999999902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32009999999911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16004999999990 + 16004999999991.

It is an arithmetic number, because the mean of its divisors is an integer number (16004999999991).

Almost surely, 2^{32009999999981} is an apocalyptic number.

It is an amenable number.

32009999999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

32009999999981 is an equidigital number, since it uses as much as digits as its factorization.

32009999999981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2066242608, while the sum is 86.

The spelling of 32009999999981 in words is "thirty-two trillion, nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".