639136245 has 32 divisors (see below), whose sum is σ = 1123113600. Its totient is φ = 307792640.

The previous prime is 639136241. The next prime is 639136247. The reversal of 639136245 is 542631936.

639136245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 639136245 - 2² = 639136241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639136241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11587 + ... + 37583.

It is an arithmetic number, because the mean of its divisors is an integer number (35097300).

Almost surely, 2^639136245 is an apocalyptic number.

It is an amenable number.

639136245 is a deficient number, since it is larger than the sum of its proper divisors (483977355).

639136245 is a wasteful number, since it uses less digits than its factorization.

639136245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26165.

The product of its digits is 116640, while the sum is 39.

The square root of 639136245 is about 25281.1440603466. The cubic root of 639136245 is about 861.3860131933.

The spelling of 639136245 in words is "six hundred thirty-nine million, one hundred thirty-six thousand, two hundred forty-five".