1312111123 has 2 divisors, whose sum is σ = 1312111124. Its totient is φ = 1312111122.

The previous prime is 1312111117. The next prime is 1312111127. The reversal of 1312111123 is 3211112131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1312111123 - 2¹⁷ = 1311980051 is a prime.

It is a super-2 number, since 2×1312111123² = 3443271198200642258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1312111097 and 1312111106.

It is not a weakly prime, because it can be changed into another prime (1312111127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656055561 + 656055562.

It is an arithmetic number, because the mean of its divisors is an integer number (656055562).

Almost surely, 2^1312111123 is an apocalyptic number.

1312111123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312111123 is an equidigital number, since it uses as much as digits as its factorization.

1312111123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 16.

The square root of 1312111123 is about 36223.0744553800. The cubic root of 1312111123 is about 1094.7716413216.

Adding to 1312111123 its reverse (3211112131), we get a palindrome (4523223254).

The spelling of 1312111123 in words is "one billion, three hundred twelve million, one hundred eleven thousand, one hundred twenty-three".