32821561 has 2 divisors, whose sum is σ = 32821562. Its totient is φ = 32821560.

The previous prime is 32821519. The next prime is 32821573. The reversal of 32821561 is 16512823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19360000 + 13461561 = 4400^2 + 3669^2 .

It is an emirp because it is prime and its reverse (16512823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 32821561 - 2⁷ = 32821433 is a prime.

It is not a weakly prime, because it can be changed into another prime (32821961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16410780 + 16410781.

It is an arithmetic number, because the mean of its divisors is an integer number (16410781).

Almost surely, 2^32821561 is an apocalyptic number.

It is an amenable number.

32821561 is a deficient number, since it is larger than the sum of its proper divisors (1).

32821561 is an equidigital number, since it uses as much as digits as its factorization.

32821561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 32821561 is about 5729.0104730224. The cubic root of 32821561 is about 320.1742573038.

The spelling of 32821561 in words is "thirty-two million, eight hundred twenty-one thousand, five hundred sixty-one".