649812829 has 2 divisors, whose sum is σ = 649812830. Its totient is φ = 649812828.

The previous prime is 649812827. The next prime is 649812847. The reversal of 649812829 is 928218946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 622752025 + 27060804 = 24955^2 + 5202^2 .

It is a cyclic number.

It is not a de Polignac number, because 649812829 - 2¹ = 649812827 is a prime.

Together with 649812827, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649812827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324906414 + 324906415.

It is an arithmetic number, because the mean of its divisors is an integer number (324906415).

Almost surely, 2^649812829 is an apocalyptic number.

It is an amenable number.

649812829 is a deficient number, since it is larger than the sum of its proper divisors (1).

649812829 is an equidigital number, since it uses as much as digits as its factorization.

649812829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 49.

The square root of 649812829 is about 25491.4265783616. The cubic root of 649812829 is about 866.1559512873.

The spelling of 649812829 in words is "six hundred forty-nine million, eight hundred twelve thousand, eight hundred twenty-nine".