641002402 has 4 divisors (see below), whose sum is σ = 961503606. Its totient is φ = 320501200.

The previous prime is 641002381. The next prime is 641002421. The reversal of 641002402 is 204200146.

641002402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204200146 = 2 ⋅102100073.

It can be written as a sum of positive squares in only one way, i.e., 608066281 + 32936121 = 24659^2 + 5739^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 641002402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160250599 + ... + 160250602.

Almost surely, 2^641002402 is an apocalyptic number.

641002402 is a deficient number, since it is larger than the sum of its proper divisors (320501204).

641002402 is a wasteful number, since it uses less digits than its factorization.

641002402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320501203.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 641002402 is about 25318.0252389478. The cubic root of 641002402 is about 862.2235599969.

Adding to 641002402 its reverse (204200146), we get a palindrome (845202548).

The spelling of 641002402 in words is "six hundred forty-one million, two thousand, four hundred two".