649051789 has 12 divisors (see below), whose sum is σ = 718419996. Its totient is φ = 584304512.

The previous prime is 649051759. The next prime is 649051877. The reversal of 649051789 is 987150946.

It can be written as a sum of positive squares in 2 ways, for example, as 270438025 + 378613764 = 16445^2 + 19458^2 .

It is not a de Polignac number, because 649051789 - 2⁵ = 649051757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649051729) 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 in 11 ways as a sum of consecutive naturals, for example, 27094 + ... + 45079.

It is an arithmetic number, because the mean of its divisors is an integer number (59868333).

Almost surely, 2^649051789 is an apocalyptic number.

It is an amenable number.

649051789 is a deficient number, since it is larger than the sum of its proper divisors (69368207).

649051789 is a wasteful number, since it uses less digits than its factorization.

649051789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72236 (or 72213 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 649051789 is about 25476.4948334735. The cubic root of 649051789 is about 865.8176811476.

The spelling of 649051789 in words is "six hundred forty-nine million, fifty-one thousand, seven hundred eighty-nine".