639523101 has 8 divisors (see below), whose sum is σ = 974511424. Its totient is φ = 365441760.

The previous prime is 639523099. The next prime is 639523103. The reversal of 639523101 is 101325936.

639523101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (639523099) and next prime (639523103).

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

It is not a de Polignac number, because 639523101 - 2¹ = 639523099 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 (639523103) 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, 15226720 + ... + 15226761.

It is an arithmetic number, because the mean of its divisors is an integer number (121813928).

Almost surely, 2^639523101 is an apocalyptic number.

It is an amenable number.

639523101 is a deficient number, since it is larger than the sum of its proper divisors (334988323).

639523101 is a wasteful number, since it uses less digits than its factorization.

639523101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30453491.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 639523101 is about 25288.7939807338. The cubic root of 639523101 is about 861.5597712091.

The spelling of 639523101 in words is "six hundred thirty-nine million, five hundred twenty-three thousand, one hundred one".