1311199061 has 2 divisors, whose sum is σ = 1311199062. Its totient is φ = 1311199060.

The previous prime is 1311199051. The next prime is 1311199117. The reversal of 1311199061 is 1609911131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 690690961 + 620508100 = 26281^2 + 24910^2 .

It is an emirp because it is prime and its reverse (1609911131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311199061 - 2¹⁸ = 1310936917 is a prime.

It is a super-3 number, since 3×1311199061³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311199051) 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, 655599530 + 655599531.

It is an arithmetic number, because the mean of its divisors is an integer number (655599531).

Almost surely, 2^1311199061 is an apocalyptic number.

It is an amenable number.

1311199061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311199061 is an equidigital number, since it uses as much as digits as its factorization.

1311199061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 1311199061 is about 36210.4827501650. The cubic root of 1311199061 is about 1094.5179201643.

The spelling of 1311199061 in words is "one billion, three hundred eleven million, one hundred ninety-nine thousand, sixty-one".