639192041 has 4 divisors (see below), whose sum is σ = 640374084. Its totient is φ = 638010000.

The previous prime is 639192019. The next prime is 639192067. The reversal of 639192041 is 140291936.

639192041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 214007641 + 425184400 = 14629^2 + 20620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639192041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639191992 and 639192010.

It is not an unprimeable number, because it can be changed into a prime (639195041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590210 + ... + 591291.

It is an arithmetic number, because the mean of its divisors is an integer number (160093521).

Almost surely, 2^639192041 is an apocalyptic number.

It is an amenable number.

639192041 is a deficient number, since it is larger than the sum of its proper divisors (1182043).

639192041 is a wasteful number, since it uses less digits than its factorization.

639192041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182042.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 639192041 is about 25282.2475464505. The cubic root of 639192041 is about 861.4110785300.

The spelling of 639192041 in words is "six hundred thirty-nine million, one hundred ninety-two thousand, forty-one".