649126791 has 20 divisors (see below), whose sum is σ = 986125800. Its totient is φ = 425413296.

The previous prime is 649126787. The next prime is 649126837. The reversal of 649126791 is 197621946.

649126791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 649126791 - 2² = 649126787 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649126711) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 63136 + ... + 72693.

It is an arithmetic number, because the mean of its divisors is an integer number (49306290).

Almost surely, 2^649126791 is an apocalyptic number.

649126791 is a deficient number, since it is larger than the sum of its proper divisors (336999009).

649126791 is a wasteful number, since it uses less digits than its factorization.

649126791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135900 (or 135891 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 649126791 is about 25477.9667752354. The cubic root of 649126791 is about 865.8510300819.

The spelling of 649126791 in words is "six hundred forty-nine million, one hundred twenty-six thousand, seven hundred ninety-one".