641356445 has 8 divisors (see below), whose sum is σ = 784149336. Its totient is φ = 503404096.

The previous prime is 641356421. The next prime is 641356447. The reversal of 641356445 is 544653146.

641356445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 200902276 + 440454169 = 14174^2 + 20987^2 .

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 641356445 - 2²⁰ = 640307869 is a prime.

It is a super-2 number, since 2×641356445² = 822676179086076050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641356399 and 641356408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641356447) 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, 1209842 + ... + 1210371.

It is an arithmetic number, because the mean of its divisors is an integer number (98018667).

Almost surely, 2^641356445 is an apocalyptic number.

It is an amenable number.

641356445 is a deficient number, since it is larger than the sum of its proper divisors (142792891).

641356445 is a wasteful number, since it uses less digits than its factorization.

641356445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420271.

The product of its digits is 172800, while the sum is 38.

The square root of 641356445 is about 25325.0161895309. The cubic root of 641356445 is about 862.3822739269.

The spelling of 641356445 in words is "six hundred forty-one million, three hundred fifty-six thousand, four hundred forty-five".