641447 has 6 divisors (see below), whose sum is σ = 673368. Its totient is φ = 609884.

The previous prime is 641441. The next prime is 641453. The reversal of 641447 is 744146.

It is an interprime number because it is at equal distance from previous prime (641441) and next prime (641453).

It is not a de Polignac number, because 641447 - 2¹⁴ = 625063 is a prime.

It is a super-2 number, since 2×641447² = 822908507618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641447.

It is not an unprimeable number, because it can be changed into a prime (641441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3758 + ... + 3924.

It is an arithmetic number, because the mean of its divisors is an integer number (112228).

2⁶⁴¹⁴⁴⁷ is an apocalyptic number.

641447 is a deficient number, since it is larger than the sum of its proper divisors (31921).

641447 is an equidigital number, since it uses as much as digits as its factorization.

641447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 190 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 641447 is about 800.9038643932. The cubic root of 641447 is about 86.2422859445.

The spelling of 641447 in words is "six hundred forty-one thousand, four hundred forty-seven".