643135 has 8 divisors (see below), whose sum is σ = 776160. Its totient is φ = 511584.

The previous prime is 643129. The next prime is 643183. The reversal of 643135 is 531346.

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 643135 - 2⁹ = 642623 is a prime.

643135 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1246 + ... + 1684.

It is an arithmetic number, because the mean of its divisors is an integer number (97020).

2⁶⁴³¹³⁵ is an apocalyptic number.

643135 is a deficient number, since it is larger than the sum of its proper divisors (133025).

643135 is a wasteful number, since it uses less digits than its factorization.

643135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737.

The product of its digits is 1080, while the sum is 22.

The square root of 643135 is about 801.9569813899. The cubic root of 643135 is about 86.3178699847.

The spelling of 643135 in words is "six hundred forty-three thousand, one hundred thirty-five".