649039423291 has 16 divisors (see below), whose sum is σ = 751414406400. Its totient is φ = 549124479648.

The previous prime is 649039423267. The next prime is 649039423313. The reversal of 649039423291 is 192324930946.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 649039423291 - 2¹¹ = 649039421243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (649039423691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1759561 + ... + 2096218.

It is an arithmetic number, because the mean of its divisors is an integer number (46963400400).

Almost surely, 2^649039423291 is an apocalyptic number.

649039423291 is a deficient number, since it is larger than the sum of its proper divisors (102374983109).

649039423291 is a wasteful number, since it uses less digits than its factorization.

649039423291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856098.

The product of its (nonzero) digits is 2519424, while the sum is 52.

The spelling of 649039423291 in words is "six hundred forty-nine billion, thirty-nine million, four hundred twenty-three thousand, two hundred ninety-one".