641943771 has 8 divisors (see below), whose sum is σ = 978200064. Its totient is φ = 366825000.

The previous prime is 641943763. The next prime is 641943773. The reversal of 641943771 is 177349146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 641943771 - 2³ = 641943763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641943773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15284355 + ... + 15284396.

It is an arithmetic number, because the mean of its divisors is an integer number (122275008).

Almost surely, 2^641943771 is an apocalyptic number.

641943771 is a deficient number, since it is larger than the sum of its proper divisors (336256293).

641943771 is a wasteful number, since it uses less digits than its factorization.

641943771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30568761.

The product of its digits is 127008, while the sum is 42.

The square root of 641943771 is about 25336.6093035355. The cubic root of 641943771 is about 862.6454375203.

The spelling of 641943771 in words is "six hundred forty-one million, nine hundred forty-three thousand, seven hundred seventy-one".