641676481 has 4 divisors (see below), whose sum is σ = 641727232. Its totient is φ = 641625732.

The previous prime is 641676467. The next prime is 641676499. The reversal of 641676481 is 184676146.

641676481 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 641676481 - 2¹⁵ = 641643713 is a prime.

It is a super-2 number, since 2×641676481² = 823497412537086722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641676421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10456 + ... + 37318.

It is an arithmetic number, because the mean of its divisors is an integer number (160431808).

Almost surely, 2^641676481 is an apocalyptic number.

It is an amenable number.

641676481 is a deficient number, since it is larger than the sum of its proper divisors (50751).

641676481 is a wasteful number, since it uses less digits than its factorization.

641676481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50750.

The product of its digits is 193536, while the sum is 43.

The square root of 641676481 is about 25331.3339759279. Note that the first 3 decimals coincide. The cubic root of 641676481 is about 862.5256926044.

The spelling of 641676481 in words is "six hundred forty-one million, six hundred seventy-six thousand, four hundred eighty-one".