318506641 has 2 divisors, whose sum is σ = 318506642. Its totient is φ = 318506640.

The previous prime is 318506597. The next prime is 318506647. The reversal of 318506641 is 146605813.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316697616 + 1809025 = 17796^2 + 1345^2 .

It is an emirp because it is prime and its reverse (146605813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318506641 - 2¹³ = 318498449 is a prime.

It is a super-2 number, since 2×318506641² = 202892960722205762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 318506597 and 318506606.

It is not a weakly prime, because it can be changed into another prime (318506647) 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, 159253320 + 159253321.

It is an arithmetic number, because the mean of its divisors is an integer number (159253321).

Almost surely, 2^318506641 is an apocalyptic number.

It is an amenable number.

318506641 is a deficient number, since it is larger than the sum of its proper divisors (1).

318506641 is an equidigital number, since it uses as much as digits as its factorization.

318506641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 318506641 is about 17846.7543547840. The cubic root of 318506641 is about 682.9247159006.

The spelling of 318506641 in words is "three hundred eighteen million, five hundred six thousand, six hundred forty-one".