641921171 has 8 divisors (see below), whose sum is σ = 655279824. Its totient is φ = 628673760.

The previous prime is 641921143. The next prime is 641921179. The reversal of 641921171 is 171129146.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 641921171 - 2¹⁴ = 641904787 is a prime.

It is a super-2 number, since 2×641921171² = 824125579556022482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641921179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16100 + ... + 39281.

It is an arithmetic number, because the mean of its divisors is an integer number (81909978).

Almost surely, 2^641921171 is an apocalyptic number.

641921171 is a deficient number, since it is larger than the sum of its proper divisors (13358653).

641921171 is a wasteful number, since it uses less digits than its factorization.

641921171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55621.

The product of its digits is 3024, while the sum is 32.

The square root of 641921171 is about 25336.1633046521. The cubic root of 641921171 is about 862.6353140917.

The spelling of 641921171 in words is "six hundred forty-one million, nine hundred twenty-one thousand, one hundred seventy-one".