643101136 has 20 divisors (see below), whose sum is σ = 1252276000. Its totient is φ = 319933152.

The previous prime is 643101133. The next prime is 643101161. The reversal of 643101136 is 631101346.

It is a happy number.

It is a super-2 number, since 2×643101136² = 827158142248980992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643101136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643101131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97806 + ... + 104173.

It is an arithmetic number, because the mean of its divisors is an integer number (62613800).

Almost surely, 2^643101136 is an apocalyptic number.

It is an amenable number.

643101136 is a deficient number, since it is larger than the sum of its proper divisors (609174864).

643101136 is a wasteful number, since it uses less digits than its factorization.

643101136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202186 (or 202180 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 643101136 is about 25359.4387950522. The cubic root of 643101136 is about 863.1635494782.

The spelling of 643101136 in words is "six hundred forty-three million, one hundred one thousand, one hundred thirty-six".