641783 has 4 divisors (see below), whose sum is σ = 644688. Its totient is φ = 638880.

The previous prime is 641761. The next prime is 641789. The reversal of 641783 is 387146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 387146 = 2 ⋅193573.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641789) 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, 1091 + ... + 1572.

It is an arithmetic number, because the mean of its divisors is an integer number (161172).

2⁶⁴¹⁷⁸³ is an apocalyptic number.

641783 is a deficient number, since it is larger than the sum of its proper divisors (2905).

641783 is a wasteful number, since it uses less digits than its factorization.

641783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2904.

The product of its digits is 4032, while the sum is 29.

The square root of 641783 is about 801.1135999345. The cubic root of 641783 is about 86.2573416701.

The spelling of 641783 in words is "six hundred forty-one thousand, seven hundred eighty-three".