32755721 has 2 divisors, whose sum is σ = 32755722. Its totient is φ = 32755720.

The previous prime is 32755711. The next prime is 32755729. The reversal of 32755721 is 12755723.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23145721 + 9610000 = 4811^2 + 3100^2 .

It is an emirp because it is prime and its reverse (12755723) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 32755721 - 2¹⁸ = 32493577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (32755729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16377860 + 16377861.

It is an arithmetic number, because the mean of its divisors is an integer number (16377861).

Almost surely, 2^32755721 is an apocalyptic number.

It is an amenable number.

32755721 is a deficient number, since it is larger than the sum of its proper divisors (1).

32755721 is an equidigital number, since it uses as much as digits as its factorization.

32755721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14700, while the sum is 32.

The square root of 32755721 is about 5723.2613953934. The cubic root of 32755721 is about 319.9600243032.

The spelling of 32755721 in words is "thirty-two million, seven hundred fifty-five thousand, seven hundred twenty-one".