641464189 has 2 divisors, whose sum is σ = 641464190. Its totient is φ = 641464188.

The previous prime is 641464177. The next prime is 641464193. The reversal of 641464189 is 981464146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 637158564 + 4305625 = 25242^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 641464189 - 2²³ = 633075581 is a prime.

It is a super-2 number, since 2×641464189² = 822952611538855442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641464199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320732094 + 320732095.

It is an arithmetic number, because the mean of its divisors is an integer number (320732095).

Almost surely, 2^641464189 is an apocalyptic number.

It is an amenable number.

641464189 is a deficient number, since it is larger than the sum of its proper divisors (1).

641464189 is an equidigital number, since it uses as much as digits as its factorization.

641464189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 43.

The square root of 641464189 is about 25327.1433248995. The cubic root of 641464189 is about 862.4305628900.

Subtracting from 641464189 its sum of digits (43), we obtain a palindrome (641464146).

The spelling of 641464189 in words is "six hundred forty-one million, four hundred sixty-four thousand, one hundred eighty-nine".