649413221 has 2 divisors, whose sum is σ = 649413222. Its totient is φ = 649413220.

The previous prime is 649413161. The next prime is 649413283. The reversal of 649413221 is 122314946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374848321 + 274564900 = 19361^2 + 16570^2 .

It is a cyclic number.

It is not a de Polignac number, because 649413221 - 2¹⁴ = 649396837 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669413221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324706610 + 324706611.

It is an arithmetic number, because the mean of its divisors is an integer number (324706611).

Almost surely, 2^649413221 is an apocalyptic number.

It is an amenable number.

649413221 is a deficient number, since it is larger than the sum of its proper divisors (1).

649413221 is an equidigital number, since it uses as much as digits as its factorization.

649413221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 649413221 is about 25483.5872867224. The cubic root of 649413221 is about 865.9783648569.

The spelling of 649413221 in words is "six hundred forty-nine million, four hundred thirteen thousand, two hundred twenty-one".