639552213 has 8 divisors (see below), whose sum is σ = 947484800. Its totient is φ = 426368124.

The previous prime is 639552203. The next prime is 639552229. The reversal of 639552213 is 312255936.

639552213 is a `hidden beast` number, since 6 + 395 + 52 + 213 = 666.

It is not a de Polignac number, because 639552213 - 2⁶ = 639552149 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 (639552203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11843533 + ... + 11843586.

It is an arithmetic number, because the mean of its divisors is an integer number (118435600).

Almost surely, 2^639552213 is an apocalyptic number.

It is an amenable number.

639552213 is a deficient number, since it is larger than the sum of its proper divisors (307932587).

639552213 is a wasteful number, since it uses less digits than its factorization.

639552213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23687128 (or 23687122 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 639552213 is about 25289.3695650959. The cubic root of 639552213 is about 861.5728441523.

The spelling of 639552213 in words is "six hundred thirty-nine million, five hundred fifty-two thousand, two hundred thirteen".