640141013 has 2 divisors, whose sum is σ = 640141014. Its totient is φ = 640141012.

The previous prime is 640140971. The next prime is 640141057. The reversal of 640141013 is 310141046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 437562724 + 202578289 = 20918^2 + 14233^2 .

It is a cyclic number.

It is not a de Polignac number, because 640141013 - 2¹⁴ = 640124629 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640141093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320070506 + 320070507.

It is an arithmetic number, because the mean of its divisors is an integer number (320070507).

Almost surely, 2^640141013 is an apocalyptic number.

It is an amenable number.

640141013 is a deficient number, since it is larger than the sum of its proper divisors (1).

640141013 is an equidigital number, since it uses as much as digits as its factorization.

640141013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 640141013 is about 25301.0081419694. The cubic root of 640141013 is about 861.8371637188.

Adding to 640141013 its reverse (310141046), we get a palindrome (950282059).

The spelling of 640141013 in words is "six hundred forty million, one hundred forty-one thousand, thirteen".