642831135 has 8 divisors (see below), whose sum is σ = 1028529840. Its totient is φ = 342843264.

The previous prime is 642831131. The next prime is 642831181. The reversal of 642831135 is 531138246.

642831135 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 642831135 - 2² = 642831131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642831096 and 642831105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642831131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21427690 + ... + 21427719.

It is an arithmetic number, because the mean of its divisors is an integer number (128566230).

Almost surely, 2^642831135 is an apocalyptic number.

642831135 is a deficient number, since it is larger than the sum of its proper divisors (385698705).

642831135 is a wasteful number, since it uses less digits than its factorization.

642831135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42855417.

The product of its digits is 17280, while the sum is 33.

The square root of 642831135 is about 25354.1147548085. The cubic root of 642831135 is about 863.0427350725.

The spelling of 642831135 in words is "six hundred forty-two million, eight hundred thirty-one thousand, one hundred thirty-five".