641401 has 8 divisors (see below), whose sum is σ = 679680. Its totient is φ = 604032.

The previous prime is 641387. The next prime is 641411. The reversal of 641401 is 104146.

It is a happy number.

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 641401 - 2¹³ = 633209 is a prime.

It is a super-2 number, since 2×641401² = 822790485602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641411) 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 7 ways as a sum of consecutive naturals, for example, 1641 + ... + 1993.

It is an arithmetic number, because the mean of its divisors is an integer number (84960).

2⁶⁴¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

641401 is a deficient number, since it is larger than the sum of its proper divisors (38279).

641401 is a wasteful number, since it uses less digits than its factorization.

641401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 641401 is about 800.8751463243. The cubic root of 641401 is about 86.2402243349.

Adding to 641401 its reverse (104146), we get a palindrome (745547).

The spelling of 641401 in words is "six hundred forty-one thousand, four hundred one".