642683173 has 4 divisors (see below), whose sum is σ = 701108928. Its totient is φ = 584257420.

The previous prime is 642683143. The next prime is 642683177. The reversal of 642683173 is 371386246.

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 not a de Polignac number, because 642683173 - 2²¹ = 640586021 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642683177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29212861 + ... + 29212882.

It is an arithmetic number, because the mean of its divisors is an integer number (175277232).

Almost surely, 2^642683173 is an apocalyptic number.

It is an amenable number.

642683173 is a deficient number, since it is larger than the sum of its proper divisors (58425755).

642683173 is a wasteful number, since it uses less digits than its factorization.

642683173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58425754.

The product of its digits is 145152, while the sum is 40.

The square root of 642683173 is about 25351.1966778691. The cubic root of 642683173 is about 862.9765137790.

The spelling of 642683173 in words is "six hundred forty-two million, six hundred eighty-three thousand, one hundred seventy-three".