639492001 has 4 divisors (see below), whose sum is σ = 654363952. Its totient is φ = 624620052.

The previous prime is 639491989. The next prime is 639492017. The reversal of 639492001 is 100294936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 639492001 - 2⁵ = 639491969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639492031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7435911 + ... + 7435996.

It is an arithmetic number, because the mean of its divisors is an integer number (163590988).

Almost surely, 2^639492001 is an apocalyptic number.

It is an amenable number.

639492001 is a deficient number, since it is larger than the sum of its proper divisors (14871951).

639492001 is a wasteful number, since it uses less digits than its factorization.

639492001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14871950.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 639492001 is about 25288.1790763985. The cubic root of 639492001 is about 861.5458051026.

The spelling of 639492001 in words is "six hundred thirty-nine million, four hundred ninety-two thousand, one".