642481213 has 12 divisors (see below), whose sum is σ = 706200768. Its totient is φ = 579680040.

The previous prime is 642481183. The next prime is 642481243. The reversal of 642481213 is 312184246.

It is an interprime number because it is at equal distance from previous prime (642481183) and next prime (642481243).

It is not a de Polignac number, because 642481213 - 2¹³ = 642473021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642481243) 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 11 ways as a sum of consecutive naturals, for example, 211020 + ... + 214042.

It is an arithmetic number, because the mean of its divisors is an integer number (58850064).

Almost surely, 2^642481213 is an apocalyptic number.

It is an amenable number.

642481213 is a deficient number, since it is larger than the sum of its proper divisors (63719555).

642481213 is a wasteful number, since it uses less digits than its factorization.

642481213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312 (or 3173 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 642481213 is about 25347.2131209725. The cubic root of 642481213 is about 862.8861089452.

The spelling of 642481213 in words is "six hundred forty-two million, four hundred eighty-one thousand, two hundred thirteen".