1231200001123 has 2 divisors, whose sum is σ = 1231200001124. Its totient is φ = 1231200001122.

The previous prime is 1231200001093. The next prime is 1231200001127. The reversal of 1231200001123 is 3211000021321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231200001123 - 2⁵ = 1231200001091 is a prime.

It is a super-2 number, since 2×1231200001123² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231200001097 and 1231200001106.

It is not a weakly prime, because it can be changed into another prime (1231200001127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615600000561 + 615600000562.

It is an arithmetic number, because the mean of its divisors is an integer number (615600000562).

Almost surely, 2^{1231200001123} is an apocalyptic number.

1231200001123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231200001123 is an equidigital number, since it uses as much as digits as its factorization.

1231200001123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1231200001123 its reverse (3211000021321), we get a palindrome (4442200022444).

The spelling of 1231200001123 in words is "one trillion, two hundred thirty-one billion, two hundred million, one thousand, one hundred twenty-three".