39609221 has 2 divisors, whose sum is σ = 39609222. Its totient is φ = 39609220.

The previous prime is 39609217. The next prime is 39609223. The reversal of 39609221 is 12290693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36168196 + 3441025 = 6014^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 39609221 - 2² = 39609217 is a prime.

Together with 39609223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39609223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19804610 + 19804611.

It is an arithmetic number, because the mean of its divisors is an integer number (19804611).

Almost surely, 2^39609221 is an apocalyptic number.

It is an amenable number.

39609221 is a deficient number, since it is larger than the sum of its proper divisors (1).

39609221 is an equidigital number, since it uses as much as digits as its factorization.

39609221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 39609221 is about 6293.5857029201. The cubic root of 39609221 is about 340.8778382685.

The spelling of 39609221 in words is "thirty-nine million, six hundred nine thousand, two hundred twenty-one".