640419041 has 2 divisors, whose sum is σ = 640419042. Its totient is φ = 640419040.

The previous prime is 640418957. The next prime is 640419047. The reversal of 640419041 is 140914046.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638623441 + 1795600 = 25271^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 640419041 - 2¹⁰ = 640418017 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 640418995 and 640419013.

It is not a weakly prime, because it can be changed into another prime (640419047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320209520 + 320209521.

It is an arithmetic number, because the mean of its divisors is an integer number (320209521).

Almost surely, 2^640419041 is an apocalyptic number.

It is an amenable number.

640419041 is a deficient number, since it is larger than the sum of its proper divisors (1).

640419041 is an equidigital number, since it uses as much as digits as its factorization.

640419041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 640419041 is about 25306.5019510797. The cubic root of 640419041 is about 861.9619175758.

The spelling of 640419041 in words is "six hundred forty million, four hundred nineteen thousand, forty-one".