32640991 has 2 divisors, whose sum is σ = 32640992. Its totient is φ = 32640990.

The previous prime is 32640989. The next prime is 32641013. The reversal of 32640991 is 19904623.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 32640991 - 2¹ = 32640989 is a prime.

Together with 32640989, 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 (32640931) 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 as a sum of consecutive naturals, namely, 16320495 + 16320496.

It is an arithmetic number, because the mean of its divisors is an integer number (16320496).

Almost surely, 2^32640991 is an apocalyptic number.

32640991 is a deficient number, since it is larger than the sum of its proper divisors (1).

32640991 is an equidigital number, since it uses as much as digits as its factorization.

32640991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 32640991 is about 5713.2294720237. The cubic root of 32640991 is about 319.5860239251.

The spelling of 32640991 in words is "thirty-two million, six hundred forty thousand, nine hundred ninety-one".