642111 has 8 divisors (see below), whose sum is σ = 861360. Its totient is φ = 425472.

The previous prime is 642079. The next prime is 642113. The reversal of 642111 is 111246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642111 - 2⁵ = 642079 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25 + ... + 1133.

It is an arithmetic number, because the mean of its divisors is an integer number (107670).

2⁶⁴²¹¹¹ is an apocalyptic number.

642111 is a deficient number, since it is larger than the sum of its proper divisors (219249).

642111 is a wasteful number, since it uses less digits than its factorization.

642111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305.

The product of its digits is 48, while the sum is 15.

The square root of 642111 is about 801.3182888216. The cubic root of 642111 is about 86.2720338581.

Adding to 642111 its reverse (111246), we get a palindrome (753357).

The spelling of 642111 in words is "six hundred forty-two thousand, one hundred eleven".