646045919 has 16 divisors (see below), whose sum is σ = 681384960. Its totient is φ = 611355360.

The previous prime is 646045909. The next prime is 646045957. The reversal of 646045919 is 919540646.

646045919 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 646045919 - 2⁴ = 646045903 is a prime.

It is a super-2 number, since 2×646045919² = 834750658913109122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646045919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646045909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1159589 + ... + 1160145.

It is an arithmetic number, because the mean of its divisors is an integer number (42586560).

Almost surely, 2^646045919 is an apocalyptic number.

646045919 is a deficient number, since it is larger than the sum of its proper divisors (35339041).

646045919 is a wasteful number, since it uses less digits than its factorization.

646045919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 646045919 is about 25417.4333676711. The cubic root of 646045919 is about 864.4790291828.

The spelling of 646045919 in words is "six hundred forty-six million, forty-five thousand, nine hundred nineteen".