642171142 has 4 divisors (see below), whose sum is σ = 963256716. Its totient is φ = 321085570.

The previous prime is 642171133. The next prime is 642171181. The reversal of 642171142 is 241171246.

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

It is a super-3 number, since 3×642171142³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 642171142.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160542784 + ... + 160542787.

It is an arithmetic number, because the mean of its divisors is an integer number (240814179).

Almost surely, 2^642171142 is an apocalyptic number.

642171142 is a deficient number, since it is larger than the sum of its proper divisors (321085574).

642171142 is a wasteful number, since it uses less digits than its factorization.

642171142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321085573.

The product of its digits is 2688, while the sum is 28.

The square root of 642171142 is about 25341.0959115820. The cubic root of 642171142 is about 862.7472727132.

The spelling of 642171142 in words is "six hundred forty-two million, one hundred seventy-one thousand, one hundred forty-two".