641804623 has 2 divisors, whose sum is σ = 641804624. Its totient is φ = 641804622.

The previous prime is 641804609. The next prime is 641804633. The reversal of 641804623 is 326408146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641804623 - 2²⁹ = 104933711 is a prime.

It is a super-3 number, since 3×641804623³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641804633) 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, 320902311 + 320902312.

It is an arithmetic number, because the mean of its divisors is an integer number (320902312).

Almost surely, 2^641804623 is an apocalyptic number.

641804623 is a deficient number, since it is larger than the sum of its proper divisors (1).

641804623 is an equidigital number, since it uses as much as digits as its factorization.

641804623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 641804623 is about 25333.8631677050. The cubic root of 641804623 is about 862.5831038877.

The spelling of 641804623 in words is "six hundred forty-one million, eight hundred four thousand, six hundred twenty-three".