1312101111989 has 2 divisors, whose sum is σ = 1312101111990. Its totient is φ = 1312101111988.

The previous prime is 1312101111983. The next prime is 1312101112033. The reversal of 1312101111989 is 9891111012131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1027567416100 + 284533695889 = 1013690^2 + 533417^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312101111989 - 2⁴ = 1312101111973 is a prime.

It is a super-2 number, since 2×1312101111989² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312101111983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656050555994 + 656050555995.

It is an arithmetic number, because the mean of its divisors is an integer number (656050555995).

Almost surely, 2^{1312101111989} is an apocalyptic number.

It is an amenable number.

1312101111989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312101111989 is an equidigital number, since it uses as much as digits as its factorization.

1312101111989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 38.

The spelling of 1312101111989 in words is "one trillion, three hundred twelve billion, one hundred one million, one hundred eleven thousand, nine hundred eighty-nine".