318511481 has 2 divisors, whose sum is σ = 318511482. Its totient is φ = 318511480.

The previous prime is 318511471. The next prime is 318511517. The reversal of 318511481 is 184115813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248220025 + 70291456 = 15755^2 + 8384^2 .

It is a cyclic number.

It is not a de Polignac number, because 318511481 - 2²² = 314317177 is a prime.

It is a super-2 number, since 2×318511481² = 202899127057626722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (318511451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159255740 + 159255741.

It is an arithmetic number, because the mean of its divisors is an integer number (159255741).

Almost surely, 2^318511481 is an apocalyptic number.

It is an amenable number.

318511481 is a deficient number, since it is larger than the sum of its proper divisors (1).

318511481 is an equidigital number, since it uses as much as digits as its factorization.

318511481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 32.

The square root of 318511481 is about 17846.8899531543. The cubic root of 318511481 is about 682.9281751052.

The spelling of 318511481 in words is "three hundred eighteen million, five hundred eleven thousand, four hundred eighty-one".