642101 has 4 divisors (see below), whose sum is σ = 657804. Its totient is φ = 626400.

The previous prime is 642079. The next prime is 642113. The reversal of 642101 is 101246.

642101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 361201 + 280900 = 601^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 642101 - 2¹⁰ = 641077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642121) 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, 7790 + ... + 7871.

It is an arithmetic number, because the mean of its divisors is an integer number (164451).

2⁶⁴²¹⁰¹ is an apocalyptic number.

It is an amenable number.

642101 is a deficient number, since it is larger than the sum of its proper divisors (15703).

642101 is a wasteful number, since it uses less digits than its factorization.

642101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15702.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 642101 is about 801.3120490795. The cubic root of 642101 is about 86.2715859995.

Adding to 642101 its reverse (101246), we get a palindrome (743347).

The spelling of 642101 in words is "six hundred forty-two thousand, one hundred one".