618310393 has 2 divisors, whose sum is σ = 618310394. Its totient is φ = 618310392.

The previous prime is 618310379. The next prime is 618310439. The reversal of 618310393 is 393013816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354832569 + 263477824 = 18837^2 + 16232^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618310393 is a prime.

It is not a weakly prime, because it can be changed into another prime (618310493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309155196 + 309155197.

It is an arithmetic number, because the mean of its divisors is an integer number (309155197).

Almost surely, 2^618310393 is an apocalyptic number.

It is an amenable number.

618310393 is a deficient number, since it is larger than the sum of its proper divisors (1).

618310393 is an equidigital number, since it uses as much as digits as its factorization.

618310393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 618310393 is about 24865.8479244123. The cubic root of 618310393 is about 851.9266070226.

The spelling of 618310393 in words is "six hundred eighteen million, three hundred ten thousand, three hundred ninety-three".