641826847 has 2 divisors, whose sum is σ = 641826848. Its totient is φ = 641826846.

The previous prime is 641826841. The next prime is 641826893. The reversal of 641826847 is 748628146.

It is an a-pointer prime, because the next prime (641826893) can be obtained adding 641826847 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641826847 is a prime.

It is a super-2 number, since 2×641826847² = 823883403059922818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641826797 and 641826806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641826841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320913423 + 320913424.

It is an arithmetic number, because the mean of its divisors is an integer number (320913424).

Almost surely, 2^641826847 is an apocalyptic number.

641826847 is a deficient number, since it is larger than the sum of its proper divisors (1).

641826847 is an equidigital number, since it uses as much as digits as its factorization.

641826847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 46.

The square root of 641826847 is about 25334.3017863134. The cubic root of 641826847 is about 862.5930600982.

The spelling of 641826847 in words is "six hundred forty-one million, eight hundred twenty-six thousand, eight hundred forty-seven".