1312023123511 has 4 divisors (see below), whose sum is σ = 1312025788024. Its totient is φ = 1312020459000.

The previous prime is 1312023123497. The next prime is 1312023123527. The reversal of 1312023123511 is 1153213202131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1312023123511 - 2⁵ = 1312023123479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312023123581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354405 + ... + 1658206.

It is an arithmetic number, because the mean of its divisors is an integer number (328006447006).

Almost surely, 2^{1312023123511} is an apocalyptic number.

1312023123511 is a deficient number, since it is larger than the sum of its proper divisors (2664513).

1312023123511 is an equidigital number, since it uses as much as digits as its factorization.

1312023123511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664512.

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 1312023123511 its reverse (1153213202131), we get a palindrome (2465236325642).

The spelling of 1312023123511 in words is "one trillion, three hundred twelve billion, twenty-three million, one hundred twenty-three thousand, five hundred eleven".