642334289 has 4 divisors (see below), whose sum is σ = 656001024. Its totient is φ = 628667556.

The previous prime is 642334267. The next prime is 642334309. The reversal of 642334289 is 982433246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642334289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642334489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6833297 + ... + 6833390.

It is an arithmetic number, because the mean of its divisors is an integer number (164000256).

Almost surely, 2^642334289 is an apocalyptic number.

It is an amenable number.

642334289 is a deficient number, since it is larger than the sum of its proper divisors (13666735).

642334289 is a wasteful number, since it uses less digits than its factorization.

642334289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13666734.

The product of its digits is 248832, while the sum is 41.

The square root of 642334289 is about 25344.3147273703. The cubic root of 642334289 is about 862.8203283738.

The spelling of 642334289 in words is "six hundred forty-two million, three hundred thirty-four thousand, two hundred eighty-nine".