643131797 has 16 divisors (see below), whose sum is σ = 827695104. Its totient is φ = 484974000.

The previous prime is 643131791. The next prime is 643131803. The reversal of 643131797 is 797131346.

643131797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643131791) and next prime (643131803).

It is not a de Polignac number, because 643131797 - 2¹⁶ = 643066261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643131791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132329 + ... + 137102.

It is an arithmetic number, because the mean of its divisors is an integer number (51730944).

Almost surely, 2^643131797 is an apocalyptic number.

It is an amenable number.

643131797 is a deficient number, since it is larger than the sum of its proper divisors (184563307).

643131797 is a wasteful number, since it uses less digits than its factorization.

643131797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269480.

The product of its digits is 95256, while the sum is 41.

The square root of 643131797 is about 25360.0433162091. The cubic root of 643131797 is about 863.1772668836.

The spelling of 643131797 in words is "six hundred forty-three million, one hundred thirty-one thousand, seven hundred ninety-seven".