642376571 has 4 divisors (see below), whose sum is σ = 650508000. Its totient is φ = 634245144.

The previous prime is 642376549. The next prime is 642376597. The reversal of 642376571 is 175673246.

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-642376571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642376531) 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, 4065596 + ... + 4065753.

It is an arithmetic number, because the mean of its divisors is an integer number (162627000).

Almost surely, 2^642376571 is an apocalyptic number.

642376571 is a deficient number, since it is larger than the sum of its proper divisors (8131429).

642376571 is an equidigital number, since it uses as much as digits as its factorization.

642376571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8131428.

The product of its digits is 211680, while the sum is 41.

The square root of 642376571 is about 25345.1488652168. The cubic root of 642376571 is about 862.8392598292.

The spelling of 642376571 in words is "six hundred forty-two million, three hundred seventy-six thousand, five hundred seventy-one".