32690821 has 2 divisors, whose sum is σ = 32690822. Its totient is φ = 32690820.

The previous prime is 32690809. The next prime is 32690837. The reversal of 32690821 is 12809623.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32376100 + 314721 = 5690^2 + 561^2 .

It is a cyclic number.

It is not a de Polignac number, because 32690821 - 2⁵ = 32690789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32690851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16345410 + 16345411.

It is an arithmetic number, because the mean of its divisors is an integer number (16345411).

Almost surely, 2^32690821 is an apocalyptic number.

It is an amenable number.

32690821 is a deficient number, since it is larger than the sum of its proper divisors (1).

32690821 is an equidigital number, since it uses as much as digits as its factorization.

32690821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 32690821 is about 5717.5887400197. The cubic root of 32690821 is about 319.7485687726.

The spelling of 32690821 in words is "thirty-two million, six hundred ninety thousand, eight hundred twenty-one".