645059519 has 16 divisors (see below), whose sum is σ = 749088480. Its totient is φ = 550333440.

The previous prime is 645059489. The next prime is 645059521. The reversal of 645059519 is 915950546.

It is a cyclic number.

It is not a de Polignac number, because 645059519 - 2¹⁶ = 644993983 is a prime.

It is a super-2 number, since 2×645059519² = 832203566105022722, 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 645059519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645059539) 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 15 ways as a sum of consecutive naturals, for example, 21722 + ... + 41975.

It is an arithmetic number, because the mean of its divisors is an integer number (46818030).

Almost surely, 2^645059519 is an apocalyptic number.

645059519 is a deficient number, since it is larger than the sum of its proper divisors (104028961).

645059519 is a wasteful number, since it uses less digits than its factorization.

645059519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63770.

The product of its (nonzero) digits is 243000, while the sum is 44.

The square root of 645059519 is about 25398.0219505378. The cubic root of 645059519 is about 864.0388352564.

The spelling of 645059519 in words is "six hundred forty-five million, fifty-nine thousand, five hundred nineteen".