641534401 has 4 divisors (see below), whose sum is σ = 641619904. Its totient is φ = 641448900.

The previous prime is 641534393. The next prime is 641534417. The reversal of 641534401 is 104435146.

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 an emirpimes, since its reverse is a distinct semiprime: 104435146 = 2 ⋅52217573.

It is a cyclic number.

It is not a de Polignac number, because 641534401 - 2³ = 641534393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641534401.

It is not an unprimeable number, because it can be changed into a prime (641534441) 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 3 ways as a sum of consecutive naturals, for example, 30285 + ... + 46906.

It is an arithmetic number, because the mean of its divisors is an integer number (160404976).

Almost surely, 2^641534401 is an apocalyptic number.

It is an amenable number.

641534401 is a deficient number, since it is larger than the sum of its proper divisors (85503).

641534401 is an equidigital number, since it uses as much as digits as its factorization.

641534401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85502.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 641534401 is about 25328.5293888137. The cubic root of 641534401 is about 862.4620277619.

Adding to 641534401 its reverse (104435146), we get a palindrome (745969547).

The spelling of 641534401 in words is "six hundred forty-one million, five hundred thirty-four thousand, four hundred one".