643131137 has 8 divisors (see below), whose sum is σ = 703683552. Its totient is φ = 582926400.

The previous prime is 643131109. The next prime is 643131143. The reversal of 643131137 is 731131346.

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

It is a cyclic number.

It is not a de Polignac number, because 643131137 - 2²⁴ = 626353921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643131107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83039 + ... + 90452.

It is an arithmetic number, because the mean of its divisors is an integer number (87960444).

Almost surely, 2^643131137 is an apocalyptic number.

It is an amenable number.

643131137 is a deficient number, since it is larger than the sum of its proper divisors (60552415).

643131137 is a wasteful number, since it uses less digits than its factorization.

643131137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173839.

The product of its digits is 4536, while the sum is 29.

The square root of 643131137 is about 25360.0303036097. The cubic root of 643131137 is about 863.1769716112.

The spelling of 643131137 in words is "six hundred forty-three million, one hundred thirty-one thousand, one hundred thirty-seven".