641245469 has 2 divisors, whose sum is σ = 641245470. Its totient is φ = 641245468.

The previous prime is 641245411. The next prime is 641245511. The reversal of 641245469 is 964542146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 469242244 + 172003225 = 21662^2 + 13115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641245469 is a prime.

It is a super-2 number, since 2×641245469² = 822391503026059922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_33361988 and since 641245469 and 33361988 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641295469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320622734 + 320622735.

It is an arithmetic number, because the mean of its divisors is an integer number (320622735).

Almost surely, 2^641245469 is an apocalyptic number.

It is an amenable number.

641245469 is a deficient number, since it is larger than the sum of its proper divisors (1).

641245469 is an equidigital number, since it uses as much as digits as its factorization.

641245469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 41.

The square root of 641245469 is about 25322.8250596177. The cubic root of 641245469 is about 862.3325307841.

The spelling of 641245469 in words is "six hundred forty-one million, two hundred forty-five thousand, four hundred sixty-nine".