318705643 has 2 divisors, whose sum is σ = 318705644. Its totient is φ = 318705642.

The previous prime is 318705623. The next prime is 318705649. The reversal of 318705643 is 346507813.

It is a strong prime.

It is an emirp because it is prime and its reverse (346507813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318705643 - 2²¹ = 316608491 is a prime.

It is not a weakly prime, because it can be changed into another prime (318705649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159352821 + 159352822.

It is an arithmetic number, because the mean of its divisors is an integer number (159352822).

Almost surely, 2^318705643 is an apocalyptic number.

318705643 is a deficient number, since it is larger than the sum of its proper divisors (1).

318705643 is an equidigital number, since it uses as much as digits as its factorization.

318705643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 318705643 is about 17852.3287836629. The cubic root of 318705643 is about 683.0669160650.

The spelling of 318705643 in words is "three hundred eighteen million, seven hundred five thousand, six hundred forty-three".