318045661 has 2 divisors, whose sum is σ = 318045662. Its totient is φ = 318045660.

The previous prime is 318045641. The next prime is 318045671. The reversal of 318045661 is 166540813.

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., 296012025 + 22033636 = 17205^2 + 4694^2 .

It is a cyclic number.

It is not a de Polignac number, because 318045661 - 2¹¹ = 318043613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318045601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159022830 + 159022831.

It is an arithmetic number, because the mean of its divisors is an integer number (159022831).

Almost surely, 2^318045661 is an apocalyptic number.

It is an amenable number.

318045661 is a deficient number, since it is larger than the sum of its proper divisors (1).

318045661 is an equidigital number, since it uses as much as digits as its factorization.

318045661 is an evil number, because the sum of its binary digits is even.

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

The square root of 318045661 is about 17833.8347250388. The cubic root of 318045661 is about 682.5950873612.

It can be divided in two parts, 3180 and 45661, that added together give a square (48841 = 221²).

The spelling of 318045661 in words is "three hundred eighteen million, forty-five thousand, six hundred sixty-one".