1318813121 has 2 divisors, whose sum is σ = 1318813122. Its totient is φ = 1318813120.

The previous prime is 1318813117. The next prime is 1318813141. The reversal of 1318813121 is 1213188131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1207215025 + 111598096 = 34745^2 + 10564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318813121 - 2² = 1318813117 is a prime.

It is not a weakly prime, because it can be changed into another prime (1318813141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659406560 + 659406561.

It is an arithmetic number, because the mean of its divisors is an integer number (659406561).

Almost surely, 2^1318813121 is an apocalyptic number.

It is an amenable number.

1318813121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318813121 is an equidigital number, since it uses as much as digits as its factorization.

1318813121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 29.

The square root of 1318813121 is about 36315.4666912047. The cubic root of 1318813121 is about 1096.6324340325.

The spelling of 1318813121 in words is "one billion, three hundred eighteen million, eight hundred thirteen thousand, one hundred twenty-one".