318904997 has 2 divisors, whose sum is σ = 318904998. Its totient is φ = 318904996.

The previous prime is 318904981. The next prime is 318905021. The reversal of 318904997 is 799409813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316341796 + 2563201 = 17786^2 + 1601^2 .

It is an emirp because it is prime and its reverse (799409813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318904997 - 2⁴ = 318904981 is a prime.

It is a super-2 number, since 2×318904997² = 203400794223140018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318904907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159452498 + 159452499.

It is an arithmetic number, because the mean of its divisors is an integer number (159452499).

Almost surely, 2^318904997 is an apocalyptic number.

It is an amenable number.

318904997 is a deficient number, since it is larger than the sum of its proper divisors (1).

318904997 is an equidigital number, since it uses as much as digits as its factorization.

318904997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 318904997 is about 17857.9113280361. The cubic root of 318904997 is about 683.2093084182.

The spelling of 318904997 in words is "three hundred eighteen million, nine hundred four thousand, nine hundred ninety-seven".