641897 has 2 divisors, whose sum is σ = 641898. Its totient is φ = 641896.

The previous prime is 641891. The next prime is 641909. The reversal of 641897 is 798146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 633616 + 8281 = 796^2 + 91^2 .

It is a cyclic number.

It is not a de Polignac number, because 641897 - 2⁴ = 641881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641891) 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 as a sum of consecutive naturals, namely, 320948 + 320949.

It is an arithmetic number, because the mean of its divisors is an integer number (320949).

2⁶⁴¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

641897 is a deficient number, since it is larger than the sum of its proper divisors (1).

641897 is an equidigital number, since it uses as much as digits as its factorization.

641897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 641897 is about 801.1847477330. The cubic root of 641897 is about 86.2624486688.

The spelling of 641897 in words is "six hundred forty-one thousand, eight hundred ninety-seven".