641518243 has 2 divisors, whose sum is σ = 641518244. Its totient is φ = 641518242.

The previous prime is 641518237. The next prime is 641518259. The reversal of 641518243 is 342815146.

641518243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641518243 - 2⁵ = 641518211 is a prime.

It is a super-2 number, since 2×641518243² = 823091312203614098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641518199 and 641518208.

It is not a weakly prime, because it can be changed into another prime (641518343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320759121 + 320759122.

It is an arithmetic number, because the mean of its divisors is an integer number (320759122).

Almost surely, 2^641518243 is an apocalyptic number.

641518243 is a deficient number, since it is larger than the sum of its proper divisors (1).

641518243 is an equidigital number, since it uses as much as digits as its factorization.

641518243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 34.

The square root of 641518243 is about 25328.2104184247. The cubic root of 641518243 is about 862.4547869039.

The spelling of 641518243 in words is "six hundred forty-one million, five hundred eighteen thousand, two hundred forty-three".