318605761 has 2 divisors, whose sum is σ = 318605762. Its totient is φ = 318605760.

The previous prime is 318605759. The next prime is 318605767. The reversal of 318605761 is 167506813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180096400 + 138509361 = 13420^2 + 11769^2 .

It is a cyclic number.

It is not a de Polignac number, because 318605761 - 2¹ = 318605759 is a prime.

Together with 318605759, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 318605761.

It is not a weakly prime, because it can be changed into another prime (318605767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159302880 + 159302881.

It is an arithmetic number, because the mean of its divisors is an integer number (159302881).

Almost surely, 2^318605761 is an apocalyptic number.

It is an amenable number.

318605761 is a deficient number, since it is larger than the sum of its proper divisors (1).

318605761 is an equidigital number, since it uses as much as digits as its factorization.

318605761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 318605761 is about 17849.5311142898. The cubic root of 318605761 is about 682.9955511344.

The spelling of 318605761 in words is "three hundred eighteen million, six hundred five thousand, seven hundred sixty-one".