642051 has 6 divisors (see below), whose sum is σ = 927420. Its totient is φ = 428028.

The previous prime is 642049. The next prime is 642071. The reversal of 642051 is 150246.

It is a happy number.

642051 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642051 - 2¹ = 642049 is a prime.

642051 is strictly pandigital in base 7.

It is not an unprimeable number, because it can be changed into a prime (642011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35661 + ... + 35678.

It is an arithmetic number, because the mean of its divisors is an integer number (154570).

2⁶⁴²⁰⁵¹ is an apocalyptic number.

642051 is a deficient number, since it is larger than the sum of its proper divisors (285369).

642051 is a wasteful number, since it uses less digits than its factorization.

642051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71345 (or 71342 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 642051 is about 801.2808496401. The cubic root of 642051 is about 86.2693466367.

Adding to 642051 its reverse (150246), we get a palindrome (792297).

The spelling of 642051 in words is "six hundred forty-two thousand, fifty-one".