641753911 has 2 divisors, whose sum is σ = 641753912. Its totient is φ = 641753910.

The previous prime is 641753891. The next prime is 641753921. The reversal of 641753911 is 119357146.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641753911 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641753921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320876955 + 320876956.

It is an arithmetic number, because the mean of its divisors is an integer number (320876956).

Almost surely, 2^641753911 is an apocalyptic number.

641753911 is a deficient number, since it is larger than the sum of its proper divisors (1).

641753911 is an equidigital number, since it uses as much as digits as its factorization.

641753911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 37.

The square root of 641753911 is about 25332.8622741292. The cubic root of 641753911 is about 862.5603843742.

It can be divided in two parts, 64175 and 3911, that added together give a palindrome (68086).

The spelling of 641753911 in words is "six hundred forty-one million, seven hundred fifty-three thousand, nine hundred eleven".