641222311 has 2 divisors, whose sum is σ = 641222312. Its totient is φ = 641222310.

The previous prime is 641222287. The next prime is 641222347. The reversal of 641222311 is 113222146.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641222311 is a prime.

It is a super-2 number, since 2×641222311² = 822332104248361442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641225311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320611155 + 320611156.

It is an arithmetic number, because the mean of its divisors is an integer number (320611156).

Almost surely, 2^641222311 is an apocalyptic number.

641222311 is a deficient number, since it is larger than the sum of its proper divisors (1).

641222311 is an equidigital number, since it uses as much as digits as its factorization.

641222311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 22.

The square root of 641222311 is about 25322.3678000301. The cubic root of 641222311 is about 862.3221498727.

Adding to 641222311 its reverse (113222146), we get a palindrome (754444457).

The spelling of 641222311 in words is "six hundred forty-one million, two hundred twenty-two thousand, three hundred eleven".