641633 has 2 divisors, whose sum is σ = 641634. Its totient is φ = 641632.

The previous prime is 641623. The next prime is 641639. The reversal of 641633 is 336146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 506944 + 134689 = 712^2 + 367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641633 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 641599 and 641608.

It is not a weakly prime, because it can be changed into another prime (641639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320816 + 320817.

It is an arithmetic number, because the mean of its divisors is an integer number (320817).

2⁶⁴¹⁶³³ is an apocalyptic number.

It is an amenable number.

641633 is a deficient number, since it is larger than the sum of its proper divisors (1).

641633 is an equidigital number, since it uses as much as digits as its factorization.

641633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 23.

The square root of 641633 is about 801.0199747822. The cubic root of 641633 is about 86.2506210135.

Adding to 641633 its reverse (336146), we get a palindrome (977779).

The spelling of 641633 in words is "six hundred forty-one thousand, six hundred thirty-three".