639542911 has 8 divisors (see below), whose sum is σ = 731296800. Its totient is φ = 547886688.

The previous prime is 639542909. The next prime is 639542921. The reversal of 639542911 is 119245936.

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 639542911 - 2¹ = 639542909 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 (639542921) 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, 9796 + ... + 37081.

It is an arithmetic number, because the mean of its divisors is an integer number (91412100).

Almost surely, 2^639542911 is an apocalyptic number.

639542911 is a deficient number, since it is larger than the sum of its proper divisors (91753889).

639542911 is a wasteful number, since it uses less digits than its factorization.

639542911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48833.

The product of its digits is 58320, while the sum is 40.

The square root of 639542911 is about 25289.1856531601. The cubic root of 639542911 is about 861.5686670686.

The spelling of 639542911 in words is "six hundred thirty-nine million, five hundred forty-two thousand, nine hundred eleven".