618628313 has 2 divisors, whose sum is σ = 618628314. Its totient is φ = 618628312.

The previous prime is 618628289. The next prime is 618628321. The reversal of 618628313 is 313826816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602604304 + 16024009 = 24548^2 + 4003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618628313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (618628363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309314156 + 309314157.

It is an arithmetic number, because the mean of its divisors is an integer number (309314157).

Almost surely, 2^618628313 is an apocalyptic number.

It is an amenable number.

618628313 is a deficient number, since it is larger than the sum of its proper divisors (1).

618628313 is an equidigital number, since it uses as much as digits as its factorization.

618628313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 618628313 is about 24872.2398066600. The cubic root of 618628313 is about 852.0725952419.

The spelling of 618628313 in words is "six hundred eighteen million, six hundred twenty-eight thousand, three hundred thirteen".