649239271 has 2 divisors, whose sum is σ = 649239272. Its totient is φ = 649239270.

The previous prime is 649239257. The next prime is 649239277. The reversal of 649239271 is 172932946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649239271 - 2¹¹ = 649237223 is a prime.

It is a super-2 number, since 2×649239271² = 843023262017222882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649239277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324619635 + 324619636.

It is an arithmetic number, because the mean of its divisors is an integer number (324619636).

Almost surely, 2^649239271 is an apocalyptic number.

649239271 is a deficient number, since it is larger than the sum of its proper divisors (1).

649239271 is an equidigital number, since it uses as much as digits as its factorization.

649239271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 649239271 is about 25480.1740771134. The cubic root of 649239271 is about 865.9010384421.

The spelling of 649239271 in words is "six hundred forty-nine million, two hundred thirty-nine thousand, two hundred seventy-one".