939249221 has 2 divisors, whose sum is σ = 939249222. Its totient is φ = 939249220.

The previous prime is 939249217. The next prime is 939249239. The reversal of 939249221 is 122942939.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643890625 + 295358596 = 25375^2 + 17186^2 .

It is a cyclic number.

It is not a de Polignac number, because 939249221 - 2² = 939249217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (939249251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469624610 + 469624611.

It is an arithmetic number, because the mean of its divisors is an integer number (469624611).

Almost surely, 2^939249221 is an apocalyptic number.

It is an amenable number.

939249221 is a deficient number, since it is larger than the sum of its proper divisors (1).

939249221 is an equidigital number, since it uses as much as digits as its factorization.

939249221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 939249221 is about 30647.1731322809. The cubic root of 939249221 is about 979.3252404289.

The spelling of 939249221 in words is "nine hundred thirty-nine million, two hundred forty-nine thousand, two hundred twenty-one".