640103297 has 2 divisors, whose sum is σ = 640103298. Its totient is φ = 640103296.

The previous prime is 640103281. The next prime is 640103353. The reversal of 640103297 is 792301046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522076801 + 118026496 = 22849^2 + 10864^2 .

It is a cyclic number.

It is not a de Polignac number, because 640103297 - 2⁴ = 640103281 is a prime.

It is not a weakly prime, because it can be changed into another prime (640103237) 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, 320051648 + 320051649.

It is an arithmetic number, because the mean of its divisors is an integer number (320051649).

Almost surely, 2^640103297 is an apocalyptic number.

It is an amenable number.

640103297 is a deficient number, since it is larger than the sum of its proper divisors (1).

640103297 is an equidigital number, since it uses as much as digits as its factorization.

640103297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 640103297 is about 25300.2627851965. The cubic root of 640103297 is about 861.8202374019.

The spelling of 640103297 in words is "six hundred forty million, one hundred three thousand, two hundred ninety-seven".