641628373 has 2 divisors, whose sum is σ = 641628374. Its totient is φ = 641628372.

The previous prime is 641628371. The next prime is 641628469. The reversal of 641628373 is 373826146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504316849 + 137311524 = 22457^2 + 11718^2 .

It is a cyclic number.

It is not a de Polignac number, because 641628373 - 2¹ = 641628371 is a prime.

Together with 641628371, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641628371) 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, 320814186 + 320814187.

It is an arithmetic number, because the mean of its divisors is an integer number (320814187).

Almost surely, 2^641628373 is an apocalyptic number.

It is an amenable number.

641628373 is a deficient number, since it is larger than the sum of its proper divisors (1).

641628373 is an equidigital number, since it uses as much as digits as its factorization.

641628373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 641628373 is about 25330.3843831869. The cubic root of 641628373 is about 862.5041368702.

The spelling of 641628373 in words is "six hundred forty-one million, six hundred twenty-eight thousand, three hundred seventy-three".