641326121 has 2 divisors, whose sum is σ = 641326122. Its totient is φ = 641326120.

The previous prime is 641326067. The next prime is 641326151. The reversal of 641326121 is 121623146.

641326121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 536570896 + 104755225 = 23164^2 + 10235^2 .

It is a cyclic number.

It is not a de Polignac number, because 641326121 - 2¹⁴ = 641309737 is a prime.

It is a super-2 number, since 2×641326121² = 822598386953813282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641326151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320663060 + 320663061.

It is an arithmetic number, because the mean of its divisors is an integer number (320663061).

Almost surely, 2^641326121 is an apocalyptic number.

It is an amenable number.

641326121 is a deficient number, since it is larger than the sum of its proper divisors (1).

641326121 is an equidigital number, since it uses as much as digits as its factorization.

641326121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 641326121 is about 25324.4174858969. The cubic root of 641326121 is about 862.3686822690.

Adding to 641326121 its reverse (121623146), we get a palindrome (762949267).

The spelling of 641326121 in words is "six hundred forty-one million, three hundred twenty-six thousand, one hundred twenty-one".