641449 has 4 divisors (see below), whose sum is σ = 644436. Its totient is φ = 638464.

The previous prime is 641441. The next prime is 641453. The reversal of 641449 is 944146.

641449 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 can be written as a sum of positive squares in 2 ways, for example, as 384400 + 257049 = 620^2 + 507^2 .

It is a cyclic number.

It is not a de Polignac number, because 641449 - 2³ = 641441 is a prime.

It is a super-2 number, since 2×641449² = 822913639202, which contains 22 as substring.

It is a Duffinian number.

641449 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (641441) 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, 1144 + ... + 1609.

It is an arithmetic number, because the mean of its divisors is an integer number (161109).

2⁶⁴¹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

641449 is a deficient number, since it is larger than the sum of its proper divisors (2987).

641449 is a wasteful number, since it uses less digits than its factorization.

641449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986.

The product of its digits is 3456, while the sum is 28.

The square root of 641449 is about 800.9051129816. The cubic root of 641449 is about 86.2423755775.

The spelling of 641449 in words is "six hundred forty-one thousand, four hundred forty-nine".