318040381 has 2 divisors, whose sum is σ = 318040382. Its totient is φ = 318040380.

The previous prime is 318040367. The next prime is 318040409. The reversal of 318040381 is 183040813.

It is an a-pointer prime, because the next prime (318040409) can be obtained adding 318040381 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311840281 + 6200100 = 17659^2 + 2490^2 .

It is a cyclic number.

It is not a de Polignac number, because 318040381 - 2¹³ = 318032189 is a prime.

It is a super-2 number, since 2×318040381² = 202299367893250322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318040181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159020190 + 159020191.

It is an arithmetic number, because the mean of its divisors is an integer number (159020191).

Almost surely, 2^318040381 is an apocalyptic number.

It is an amenable number.

318040381 is a deficient number, since it is larger than the sum of its proper divisors (1).

318040381 is an equidigital number, since it uses as much as digits as its factorization.

318040381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 318040381 is about 17833.6866912033. The cubic root of 318040381 is about 682.5913099979.

The spelling of 318040381 in words is "three hundred eighteen million, forty thousand, three hundred eighty-one".