641993 has 4 divisors (see below), whose sum is σ = 700368. Its totient is φ = 583620.

The previous prime is 641981. The next prime is 642011. The reversal of 641993 is 399146.

641993 is nontrivially palindromic in base 16.

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.

It is a cyclic number.

It is not a de Polignac number, because 641993 - 2⁶ = 641929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641923) 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 3 ways as a sum of consecutive naturals, for example, 29171 + ... + 29192.

It is an arithmetic number, because the mean of its divisors is an integer number (175092).

2⁶⁴¹⁹⁹³ is an apocalyptic number.

It is an amenable number.

641993 is a deficient number, since it is larger than the sum of its proper divisors (58375).

641993 is a wasteful number, since it uses less digits than its factorization.

641993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58374.

The product of its digits is 5832, while the sum is 32.

The square root of 641993 is about 801.2446567685. The cubic root of 641993 is about 86.2667488302.

The spelling of 641993 in words is "six hundred forty-one thousand, nine hundred ninety-three".