1311260123 has 4 divisors (see below), whose sum is σ = 1313385960. Its totient is φ = 1309134288.

The previous prime is 1311260117. The next prime is 1311260173. The reversal of 1311260123 is 3210621131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3210621131 = 461 ⋅6964471.

It is a cyclic number.

It is not a de Polignac number, because 1311260123 - 2⁶ = 1311260059 is a prime.

It is a super-2 number, since 2×1311260123² = 3438806220339950258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311260095 and 1311260104.

It is not an unprimeable number, because it can be changed into a prime (1311260173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061993 + ... + 1063226.

It is an arithmetic number, because the mean of its divisors is an integer number (328346490).

Almost surely, 2^1311260123 is an apocalyptic number.

1311260123 is a deficient number, since it is larger than the sum of its proper divisors (2125837).

1311260123 is an equidigital number, since it uses as much as digits as its factorization.

1311260123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125836.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1311260123 is about 36211.3258939796. The cubic root of 1311260123 is about 1094.5349103167.

Adding to 1311260123 its reverse (3210621131), we get a palindrome (4521881254).

The spelling of 1311260123 in words is "one billion, three hundred eleven million, two hundred sixty thousand, one hundred twenty-three".