641694902 has 4 divisors (see below), whose sum is σ = 962542356. Its totient is φ = 320847450.

The previous prime is 641694863. The next prime is 641694913. The reversal of 641694902 is 209496146.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 641694902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160423724 + ... + 160423727.

It is an arithmetic number, because the mean of its divisors is an integer number (240635589).

Almost surely, 2^641694902 is an apocalyptic number.

641694902 is a deficient number, since it is larger than the sum of its proper divisors (320847454).

641694902 is a wasteful number, since it uses less digits than its factorization.

641694902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320847453.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 641694902 is about 25331.6975743830. The cubic root of 641694902 is about 862.5339462100.

The spelling of 641694902 in words is "six hundred forty-one million, six hundred ninety-four thousand, nine hundred two".