643201029 has 12 divisors (see below), whose sum is σ = 941796076. Its totient is φ = 422926272.

The previous prime is 643201021. The next prime is 643201033. The reversal of 643201029 is 920102346.

643201029 is a `hidden beast` number, since 643 + 2 + 0 + 10 + 2 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 181037025 + 462164004 = 13455^2 + 21498^2 .

It is not a de Polignac number, because 643201029 - 2³ = 643201021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643200993 and 643201011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643201021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 488842 + ... + 490155.

Almost surely, 2^643201029 is an apocalyptic number.

It is an amenable number.

643201029 is a deficient number, since it is larger than the sum of its proper divisors (298595047).

643201029 is a wasteful number, since it uses less digits than its factorization.

643201029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979076 (or 979073 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 643201029 is about 25361.4082613722. The cubic root of 643201029 is about 863.2082389407.

The spelling of 643201029 in words is "six hundred forty-three million, two hundred one thousand, twenty-nine".