32731561 has 2 divisors, whose sum is σ = 32731562. Its totient is φ = 32731560.

The previous prime is 32731549. The next prime is 32731591. The reversal of 32731561 is 16513723.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29648025 + 3083536 = 5445^2 + 1756^2 .

It is an emirp because it is prime and its reverse (16513723) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 32731561 - 2¹¹ = 32729513 is a prime.

It is not a weakly prime, because it can be changed into another prime (32731591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16365780 + 16365781.

It is an arithmetic number, because the mean of its divisors is an integer number (16365781).

Almost surely, 2^32731561 is an apocalyptic number.

It is an amenable number.

32731561 is a deficient number, since it is larger than the sum of its proper divisors (1).

32731561 is an equidigital number, since it uses as much as digits as its factorization.

32731561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 28.

The square root of 32731561 is about 5721.1503213952. The cubic root of 32731561 is about 319.8813394680.

The spelling of 32731561 in words is "thirty-two million, seven hundred thirty-one thousand, five hundred sixty-one".