1312521121523 has 16 divisors (see below), whose sum is σ = 1345574212224. Its totient is φ = 1279683671040.

The previous prime is 1312521121489. The next prime is 1312521121547. The reversal of 1312521121523 is 3251211252131.

It is a cyclic number.

It is not a de Polignac number, because 1312521121523 - 2¹⁸ = 1312520859379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312521321523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89055611 + ... + 89070347.

It is an arithmetic number, because the mean of its divisors is an integer number (84098388264).

Almost surely, 2^{1312521121523} is an apocalyptic number.

1312521121523 is a deficient number, since it is larger than the sum of its proper divisors (33053090701).

1312521121523 is a wasteful number, since it uses less digits than its factorization.

1312521121523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21902.

The product of its digits is 3600, while the sum is 29.

Adding to 1312521121523 its reverse (3251211252131), we get a palindrome (4563732373654).

The spelling of 1312521121523 in words is "one trillion, three hundred twelve billion, five hundred twenty-one million, one hundred twenty-one thousand, five hundred twenty-three".