641881594 has 4 divisors (see below), whose sum is σ = 962822394. Its totient is φ = 320940796.

The previous prime is 641881577. The next prime is 641881607. The reversal of 641881594 is 495188146.

641881594 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.

It can be written as a sum of positive squares in only one way, i.e., 639432369 + 2449225 = 25287^2 + 1565^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160470397 + ... + 160470400.

Almost surely, 2^641881594 is an apocalyptic number.

641881594 is a deficient number, since it is larger than the sum of its proper divisors (320940800).

641881594 is a wasteful number, since it uses less digits than its factorization.

641881594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320940799.

The product of its digits is 276480, while the sum is 46.

The square root of 641881594 is about 25335.3822548625. The cubic root of 641881594 is about 862.6175854250.

The spelling of 641881594 in words is "six hundred forty-one million, eight hundred eighty-one thousand, five hundred ninety-four".