1123135216681 has 2 divisors, whose sum is σ = 1123135216682. Its totient is φ = 1123135216680.

The previous prime is 1123135216627. The next prime is 1123135216703. The reversal of 1123135216681 is 1866125313211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 925896195225 + 197239021456 = 962235^2 + 444116^2 .

It is an emirp because it is prime and its reverse (1866125313211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1123135216681 - 2¹⁷ = 1123135085609 is a prime.

It is a super-2 number, since 2×1123135216681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1123135216981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561567608340 + 561567608341.

It is an arithmetic number, because the mean of its divisors is an integer number (561567608341).

Almost surely, 2^{1123135216681} is an apocalyptic number.

It is an amenable number.

1123135216681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123135216681 is an equidigital number, since it uses as much as digits as its factorization.

1123135216681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The spelling of 1123135216681 in words is "one trillion, one hundred twenty-three billion, one hundred thirty-five million, two hundred sixteen thousand, six hundred eighty-one".