649731067 has 4 divisors (see below), whose sum is σ = 651153256. Its totient is φ = 648308880.

The previous prime is 649731053. The next prime is 649731073. The reversal of 649731067 is 760137946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649731067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649731037) 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 3 ways as a sum of consecutive naturals, for example, 710409 + ... + 711322.

It is an arithmetic number, because the mean of its divisors is an integer number (162788314).

Almost surely, 2^649731067 is an apocalyptic number.

649731067 is a deficient number, since it is larger than the sum of its proper divisors (1422189).

649731067 is a wasteful number, since it uses less digits than its factorization.

649731067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422188.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 649731067 is about 25489.8228122520. The cubic root of 649731067 is about 866.1196220500.

The spelling of 649731067 in words is "six hundred forty-nine million, seven hundred thirty-one thousand, sixty-seven".