642481211 has 8 divisors (see below), whose sum is σ = 668533824. Its totient is φ = 616944640.

The previous prime is 642481183. The next prime is 642481243. The reversal of 642481211 is 112184246.

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

It is a cyclic number.

It is not a de Polignac number, because 642481211 - 2¹⁰ = 642480187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642481271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126470 + ... + 131451.

It is an arithmetic number, because the mean of its divisors is an integer number (83566728).

Almost surely, 2^642481211 is an apocalyptic number.

642481211 is a deficient number, since it is larger than the sum of its proper divisors (26052613).

642481211 is a wasteful number, since it uses less digits than its factorization.

642481211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258021.

The product of its digits is 3072, while the sum is 29.

The square root of 642481211 is about 25347.2130815204. The cubic root of 642481211 is about 862.8861080499.

The spelling of 642481211 in words is "six hundred forty-two million, four hundred eighty-one thousand, two hundred eleven".