649131211 has 2 divisors, whose sum is σ = 649131212. Its totient is φ = 649131210.

The previous prime is 649131209. The next prime is 649131221. The reversal of 649131211 is 112131946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649131211 - 2¹ = 649131209 is a prime.

Together with 649131209, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 649131211.

It is not a weakly prime, because it can be changed into another prime (649131221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324565605 + 324565606.

It is an arithmetic number, because the mean of its divisors is an integer number (324565606).

Almost surely, 2^649131211 is an apocalyptic number.

649131211 is a deficient number, since it is larger than the sum of its proper divisors (1).

649131211 is an equidigital number, since it uses as much as digits as its factorization.

649131211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 649131211 is about 25478.0535167034. The cubic root of 649131211 is about 865.8529953132.

The spelling of 649131211 in words is "six hundred forty-nine million, one hundred thirty-one thousand, two hundred eleven".