643034701 has 6 divisors (see below), whose sum is σ = 650349002. Its totient is φ = 635801760.

The previous prime is 643034699. The next prime is 643034723. The reversal of 643034701 is 107430346.

It can be written as a sum of positive squares in 3 ways, for example, as 10562500 + 632472201 = 3250^2 + 25149^2 .

It is not a de Polignac number, because 643034701 - 2¹ = 643034699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643034701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643034731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32670 + ... + 48511.

Almost surely, 2^643034701 is an apocalyptic number.

643034701 is the 11341-st centered decagonal number.

It is an amenable number.

643034701 is a deficient number, since it is larger than the sum of its proper divisors (7314301).

643034701 is an frugal number, since it uses more digits than its factorization.

643034701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81359 (or 81270 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 643034701 is about 25358.1288939070. The cubic root of 643034701 is about 863.1338256696.

The spelling of 643034701 in words is "six hundred forty-three million, thirty-four thousand, seven hundred one".