641812 has 6 divisors (see below), whose sum is σ = 1123178. Its totient is φ = 320904.

The previous prime is 641803. The next prime is 641813. The reversal of 641812 is 218146.

It can be written as a sum of positive squares in only one way, i.e., 367236 + 274576 = 606^2 + 524^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80223 + ... + 80230.

2⁶⁴¹⁸¹² is an apocalyptic number.

It is an amenable number.

641812 is a deficient number, since it is larger than the sum of its proper divisors (481366).

641812 is a wasteful number, since it uses less digits than its factorization.

641812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160457 (or 160455 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 641812 is about 801.1316995351. The cubic root of 641812 is about 86.2586408762.

Adding to 641812 its reverse (218146), we get a palindrome (859958).

The spelling of 641812 in words is "six hundred forty-one thousand, eight hundred twelve".