641628469 has 2 divisors, whose sum is σ = 641628470. Its totient is φ = 641628468.

The previous prime is 641628373. The next prime is 641628503. The reversal of 641628469 is 964826146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602064369 + 39564100 = 24537^2 + 6290^2 .

It is a cyclic number.

It is not a de Polignac number, because 641628469 - 2¹³ = 641620277 is a prime.

It is a super-2 number, since 2×641628469² = 823374184462567922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641658469) 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, 320814234 + 320814235.

It is an arithmetic number, because the mean of its divisors is an integer number (320814235).

Almost surely, 2^641628469 is an apocalyptic number.

It is an amenable number.

641628469 is a deficient number, since it is larger than the sum of its proper divisors (1).

641628469 is an equidigital number, since it uses as much as digits as its factorization.

641628469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 46.

The square root of 641628469 is about 25330.3862781443. The cubic root of 641628469 is about 862.5041798859.

The spelling of 641628469 in words is "six hundred forty-one million, six hundred twenty-eight thousand, four hundred sixty-nine".