642534541 has 4 divisors (see below), whose sum is σ = 700946784. Its totient is φ = 584122300.

The previous prime is 642534481. The next prime is 642534553. The reversal of 642534541 is 145435246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642534541 - 2⁹ = 642534029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642534497 and 642534506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642544541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29206105 + ... + 29206126.

It is an arithmetic number, because the mean of its divisors is an integer number (175236696).

Almost surely, 2^642534541 is an apocalyptic number.

It is an amenable number.

642534541 is a deficient number, since it is larger than the sum of its proper divisors (58412243).

642534541 is a wasteful number, since it uses less digits than its factorization.

642534541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58412242.

The product of its digits is 57600, while the sum is 34.

The square root of 642534541 is about 25348.2650491113. The cubic root of 642534541 is about 862.9099823890.

Adding to 642534541 its reverse (145435246), we get a palindrome (787969787).

The spelling of 642534541 in words is "six hundred forty-two million, five hundred thirty-four thousand, five hundred forty-one".