639125533 has 8 divisors (see below), whose sum is σ = 648869760. Its totient is φ = 629452080.

The previous prime is 639125521. The next prime is 639125579. The reversal of 639125533 is 335521936.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639125533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639125492 and 639125501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639125503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648 + ... + 35758.

It is an arithmetic number, because the mean of its divisors is an integer number (81108720).

Almost surely, 2^639125533 is an apocalyptic number.

It is an amenable number.

639125533 is a deficient number, since it is larger than the sum of its proper divisors (9744227).

639125533 is a wasteful number, since it uses less digits than its factorization.

639125533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35387.

The product of its digits is 72900, while the sum is 37.

The square root of 639125533 is about 25280.9322019581. The cubic root of 639125533 is about 861.3812008555.

The spelling of 639125533 in words is "six hundred thirty-nine million, one hundred twenty-five thousand, five hundred thirty-three".