649394109 has 72 divisors (see below), whose sum is σ = 1182636000. Its totient is φ = 340345152.

The previous prime is 649394099. The next prime is 649394147. The reversal of 649394109 is 901493946.

It is not a de Polignac number, because 649394109 - 2⁷ = 649393981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649394189) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1301142 + ... + 1301640.

It is an arithmetic number, because the mean of its divisors is an integer number (16425500).

Almost surely, 2^649394109 is an apocalyptic number.

It is an amenable number.

649394109 is a deficient number, since it is larger than the sum of its proper divisors (533241891).

649394109 is a wasteful number, since it uses less digits than its factorization.

649394109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759 (or 749 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 649394109 is about 25483.2122975107. The cubic root of 649394109 is about 865.9698696286.

The spelling of 649394109 in words is "six hundred forty-nine million, three hundred ninety-four thousand, one hundred nine".