642441023 has 4 divisors (see below), whose sum is σ = 734218320. Its totient is φ = 550663728.

The previous prime is 642440987. The next prime is 642441077. The reversal of 642441023 is 320144246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320144246 = 2 ⋅160072123.

It is a cyclic number.

It is not a de Polignac number, because 642441023 - 2¹⁰ = 642439999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642440983 and 642441001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642441523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45888638 + ... + 45888651.

It is an arithmetic number, because the mean of its divisors is an integer number (183554580).

Almost surely, 2^642441023 is an apocalyptic number.

642441023 is a deficient number, since it is larger than the sum of its proper divisors (91777297).

642441023 is an equidigital number, since it uses as much as digits as its factorization.

642441023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91777296.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 642441023 is about 25346.4203192482. The cubic root of 642441023 is about 862.8681161411.

Adding to 642441023 its reverse (320144246), we get a palindrome (962585269).

The spelling of 642441023 in words is "six hundred forty-two million, four hundred forty-one thousand, twenty-three".