643031225 has 12 divisors (see below), whose sum is σ = 798905340. Its totient is φ = 513427200.

The previous prime is 643031201. The next prime is 643031237. The reversal of 643031225 is 522130346.

643031225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 111682624 + 531348601 = 10568^2 + 23051^2 .

It is not a de Polignac number, because 643031225 - 2¹⁸ = 642769081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643031194 and 643031203.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11660 + ... + 37709.

It is an arithmetic number, because the mean of its divisors is an integer number (66575445).

Almost surely, 2^643031225 is an apocalyptic number.

It is an amenable number.

643031225 is a deficient number, since it is larger than the sum of its proper divisors (155874115).

643031225 is a wasteful number, since it uses less digits than its factorization.

643031225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49900 (or 49895 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 643031225 is about 25358.0603556345. The cubic root of 643031225 is about 863.1322704095.

The spelling of 643031225 in words is "six hundred forty-three million, thirty-one thousand, two hundred twenty-five".