1313512181 has 2 divisors, whose sum is σ = 1313512182. Its totient is φ = 1313512180.

The previous prime is 1313512163. The next prime is 1313512219. The reversal of 1313512181 is 1812153131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1061782225 + 251729956 = 32585^2 + 15866^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313512181 - 2¹⁴ = 1313495797 is a prime.

It is a super-2 number, since 2×1313512181² = 3450628499270753522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1313512181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313512111) 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, 656756090 + 656756091.

It is an arithmetic number, because the mean of its divisors is an integer number (656756091).

Almost surely, 2^1313512181 is an apocalyptic number.

It is an amenable number.

1313512181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313512181 is an equidigital number, since it uses as much as digits as its factorization.

1313512181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 26.

The square root of 1313512181 is about 36242.4085982154. The cubic root of 1313512181 is about 1095.1611644659.

The spelling of 1313512181 in words is "one billion, three hundred thirteen million, five hundred twelve thousand, one hundred eighty-one".