640037093 has 2 divisors, whose sum is σ = 640037094. Its totient is φ = 640037092.

The previous prime is 640037089. The next prime is 640037143. The reversal of 640037093 is 390730046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 337346689 + 302690404 = 18367^2 + 17398^2 .

It is a cyclic number.

It is not a de Polignac number, because 640037093 - 2² = 640037089 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640037053) 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, 320018546 + 320018547.

It is an arithmetic number, because the mean of its divisors is an integer number (320018547).

Almost surely, 2^640037093 is an apocalyptic number.

It is an amenable number.

640037093 is a deficient number, since it is larger than the sum of its proper divisors (1).

640037093 is an equidigital number, since it uses as much as digits as its factorization.

640037093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 32.

The square root of 640037093 is about 25298.9543855077. The cubic root of 640037093 is about 861.7905245340.

The spelling of 640037093 in words is "six hundred forty million, thirty-seven thousand, ninety-three".