1123128031211 has 2 divisors, whose sum is σ = 1123128031212. Its totient is φ = 1123128031210.

The previous prime is 1123128031189. The next prime is 1123128031219. The reversal of 1123128031211 is 1121308213211.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1123128031211 - 2¹⁰ = 1123128030187 is a prime.

It is a super-2 number, since 2×1123128031211² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1123128031219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561564015605 + 561564015606.

It is an arithmetic number, because the mean of its divisors is an integer number (561564015606).

Almost surely, 2^{1123128031211} is an apocalyptic number.

1123128031211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123128031211 is an equidigital number, since it uses as much as digits as its factorization.

1123128031211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 1123128031211 in words is "one trillion, one hundred twenty-three billion, one hundred twenty-eight million, thirty-one thousand, two hundred eleven".