641544494 has 4 divisors (see below), whose sum is σ = 962316744. Its totient is φ = 320772246.

The previous prime is 641544493. The next prime is 641544499. The reversal of 641544494 is 494445146.

641544494 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 is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641544493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160386122 + ... + 160386125.

It is an arithmetic number, because the mean of its divisors is an integer number (240579186).

Almost surely, 2^641544494 is an apocalyptic number.

641544494 is a deficient number, since it is larger than the sum of its proper divisors (320772250).

641544494 is a wasteful number, since it uses less digits than its factorization.

641544494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320772249.

The product of its digits is 276480, while the sum is 41.

The square root of 641544494 is about 25328.7286297595. The cubic root of 641544494 is about 862.4665506597.

The spelling of 641544494 in words is "six hundred forty-one million, five hundred forty-four thousand, four hundred ninety-four".