641522111 has 2 divisors, whose sum is σ = 641522112. Its totient is φ = 641522110.

The previous prime is 641522087. The next prime is 641522159. The reversal of 641522111 is 111225146.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641522111 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 (641522171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320761055 + 320761056.

It is an arithmetic number, because the mean of its divisors is an integer number (320761056).

Almost surely, 2^641522111 is an apocalyptic number.

641522111 is a deficient number, since it is larger than the sum of its proper divisors (1).

641522111 is an equidigital number, since it uses as much as digits as its factorization.

641522111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 23.

The square root of 641522111 is about 25328.2867758560. The cubic root of 641522111 is about 862.4565202754.

Adding to 641522111 its reverse (111225146), we get a palindrome (752747257).

The spelling of 641522111 in words is "six hundred forty-one million, five hundred twenty-two thousand, one hundred eleven".