32539981 has 2 divisors, whose sum is σ = 32539982. Its totient is φ = 32539980.

The previous prime is 32539979. The next prime is 32540003. The reversal of 32539981 is 18993523.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27405225 + 5134756 = 5235^2 + 2266^2 .

It is an emirp because it is prime and its reverse (18993523) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 32539981 - 2¹ = 32539979 is a prime.

It is a super-2 number, since 2×32539981² = 2117700726960722, which contains 22 as substring.

Together with 32539979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32539931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16269990 + 16269991.

It is an arithmetic number, because the mean of its divisors is an integer number (16269991).

Almost surely, 2^32539981 is an apocalyptic number.

It is an amenable number.

32539981 is a deficient number, since it is larger than the sum of its proper divisors (1).

32539981 is an equidigital number, since it uses as much as digits as its factorization.

32539981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 32539981 is about 5704.3826133947. The cubic root of 32539981 is about 319.2560222952.

The spelling of 32539981 in words is "thirty-two million, five hundred thirty-nine thousand, nine hundred eighty-one".