1312211523 has 12 divisors (see below), whose sum is σ = 2035267080. Its totient is φ = 749835072.

The previous prime is 1312211477. The next prime is 1312211531. The reversal of 1312211523 is 3251122131.

It is not a de Polignac number, because 1312211523 - 2¹² = 1312207427 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1312211523.

It is not an unprimeable number, because it can be changed into a prime (1312211123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4463158 + ... + 4463451.

It is an arithmetic number, because the mean of its divisors is an integer number (169605590).

Almost surely, 2^1312211523 is an apocalyptic number.

1312211523 is a deficient number, since it is larger than the sum of its proper divisors (723055557).

1312211523 is an equidigital number, since it uses as much as digits as its factorization.

1312211523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8926626 (or 8926619 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 1312211523 is about 36224.4602858345. The cubic root of 1312211523 is about 1094.7995638218.

Adding to 1312211523 its reverse (3251122131), we get a palindrome (4563333654).

The spelling of 1312211523 in words is "one billion, three hundred twelve million, two hundred eleven thousand, five hundred twenty-three".