642934519 has 4 divisors (see below), whose sum is σ = 646198344. Its totient is φ = 639670696.

The previous prime is 642934511. The next prime is 642934529. The reversal of 642934519 is 915439246.

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

It is a cyclic number.

It is not a de Polignac number, because 642934519 - 2³ = 642934511 is a prime.

It is a super-2 number, since 2×642934519² = 826729591443522722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642934511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1631617 + ... + 1632010.

It is an arithmetic number, because the mean of its divisors is an integer number (161549586).

Almost surely, 2^642934519 is an apocalyptic number.

642934519 is a deficient number, since it is larger than the sum of its proper divisors (3263825).

642934519 is a wasteful number, since it uses less digits than its factorization.

642934519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263824.

The product of its digits is 233280, while the sum is 43.

The square root of 642934519 is about 25356.1534740583. The cubic root of 642934519 is about 863.0889991806.

The spelling of 642934519 in words is "six hundred forty-two million, nine hundred thirty-four thousand, five hundred nineteen".