640017013 has 2 divisors, whose sum is σ = 640017014. Its totient is φ = 640017012.

The previous prime is 640016987. The next prime is 640017019. The reversal of 640017013 is 310710046.

640017013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 441714289 + 198302724 = 21017^2 + 14082^2 .

It is a cyclic number.

It is not a de Polignac number, because 640017013 - 2²⁵ = 606462581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640017019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320008506 + 320008507.

It is an arithmetic number, because the mean of its divisors is an integer number (320008507).

Almost surely, 2^640017013 is an apocalyptic number.

It is an amenable number.

640017013 is a deficient number, since it is larger than the sum of its proper divisors (1).

640017013 is an equidigital number, since it uses as much as digits as its factorization.

640017013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 640017013 is about 25298.5575280489. The cubic root of 640017013 is about 861.7815120695.

Adding to 640017013 its reverse (310710046), we get a palindrome (950727059).

The spelling of 640017013 in words is "six hundred forty million, seventeen thousand, thirteen".