646211141 has 2 divisors, whose sum is σ = 646211142. Its totient is φ = 646211140.

The previous prime is 646211119. The next prime is 646211143. The reversal of 646211141 is 141112646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 637360516 + 8850625 = 25246^2 + 2975^2 .

It is a cyclic number.

It is not a de Polignac number, because 646211141 - 2⁶ = 646211077 is a prime.

Together with 646211143, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646211141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646211143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323105570 + 323105571.

It is an arithmetic number, because the mean of its divisors is an integer number (323105571).

Almost surely, 2^646211141 is an apocalyptic number.

It is an amenable number.

646211141 is a deficient number, since it is larger than the sum of its proper divisors (1).

646211141 is an equidigital number, since it uses as much as digits as its factorization.

646211141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 646211141 is about 25420.6833307053. The cubic root of 646211141 is about 864.5527178457.

Adding to 646211141 its reverse (141112646), we get a palindrome (787323787).

The spelling of 646211141 in words is "six hundred forty-six million, two hundred eleven thousand, one hundred forty-one".