642501 has 6 divisors (see below), whose sum is σ = 928070. Its totient is φ = 428328.

The previous prime is 642487. The next prime is 642517. The reversal of 642501 is 105246.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 641601 + 900 = 801^2 + 30^2 .

It is not a de Polignac number, because 642501 - 2⁷ = 642373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642501.

It is not an unprimeable number, because it can be changed into a prime (642581) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 35686 + ... + 35703.

2⁶⁴²⁵⁰¹ is an apocalyptic number.

It is an amenable number.

642501 is a deficient number, since it is larger than the sum of its proper divisors (285569).

642501 is a wasteful number, since it uses less digits than its factorization.

642501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71395 (or 71392 counting only the distinct ones).

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

The square root of 642501 is about 801.5616008767. The cubic root of 642501 is about 86.2894967182.

Adding to 642501 its reverse (105246), we get a palindrome (747747).

The spelling of 642501 in words is "six hundred forty-two thousand, five hundred one".