641248249 has 2 divisors, whose sum is σ = 641248250. Its totient is φ = 641248248.

The previous prime is 641248193. The next prime is 641248277. The reversal of 641248249 is 942842146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 557196025 + 84052224 = 23605^2 + 9168^2 .

It is a cyclic number.

It is not a de Polignac number, because 641248249 - 2¹¹ = 641246201 is a prime.

It is a super-2 number, since 2×641248249² = 822398633691132002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641248549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320624124 + 320624125.

It is an arithmetic number, because the mean of its divisors is an integer number (320624125).

Almost surely, 2^641248249 is an apocalyptic number.

It is an amenable number.

641248249 is a deficient number, since it is larger than the sum of its proper divisors (1).

641248249 is an equidigital number, since it uses as much as digits as its factorization.

641248249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 40.

The square root of 641248249 is about 25322.8799507481. The cubic root of 641248249 is about 862.3337769429. Note that the first 3 decimals are identical.

The spelling of 641248249 in words is "six hundred forty-one million, two hundred forty-eight thousand, two hundred forty-nine".