1231201123 has 2 divisors, whose sum is σ = 1231201124. Its totient is φ = 1231201122.

The previous prime is 1231201093. The next prime is 1231201141. The reversal of 1231201123 is 3211021321.

It is a strong prime.

It is an emirp because it is prime and its reverse (3211021321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231201123 - 2²⁹ = 694330211 is a prime.

It is a super-2 number, since 2×1231201123² = 3031712410552922258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231201097 and 1231201106.

It is not a weakly prime, because it can be changed into another prime (1231201823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615600561 + 615600562.

It is an arithmetic number, because the mean of its divisors is an integer number (615600562).

Almost surely, 2^1231201123 is an apocalyptic number.

1231201123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231201123 is an equidigital number, since it uses as much as digits as its factorization.

1231201123 is an evil number, because the sum of its binary digits is even.

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

The square root of 1231201123 is about 35088.4756437210. The cubic root of 1231201123 is about 1071.7899184910.

Adding to 1231201123 its reverse (3211021321), we get a palindrome (4442222444).

The spelling of 1231201123 in words is "one billion, two hundred thirty-one million, two hundred one thousand, one hundred twenty-three".