1321134523 has 4 divisors (see below), whose sum is σ = 1342792528. Its totient is φ = 1299476520.

The previous prime is 1321134517. The next prime is 1321134541. The reversal of 1321134523 is 3254311231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3254311231 = 1289 ⋅2524679.

It is a cyclic number.

It is not a de Polignac number, because 1321134523 - 2²¹ = 1319037371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321134593) 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, 10828911 + ... + 10829032.

It is an arithmetic number, because the mean of its divisors is an integer number (335698132).

Almost surely, 2^1321134523 is an apocalyptic number.

1321134523 is a deficient number, since it is larger than the sum of its proper divisors (21658005).

1321134523 is an equidigital number, since it uses as much as digits as its factorization.

1321134523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21658004.

The product of its digits is 2160, while the sum is 25.

The square root of 1321134523 is about 36347.4142546619. The cubic root of 1321134523 is about 1097.2754951974.

Adding to 1321134523 its reverse (3254311231), we get a palindrome (4575445754).

The spelling of 1321134523 in words is "one billion, three hundred twenty-one million, one hundred thirty-four thousand, five hundred twenty-three".