1320431523 has 4 divisors (see below), whose sum is σ = 1760575368. Its totient is φ = 880287680.

The previous prime is 1320431513. The next prime is 1320431561. The reversal of 1320431523 is 3251340231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3251340231 = 3 ⋅1083780077.

It is a cyclic number.

It is not a de Polignac number, because 1320431523 - 2⁴ = 1320431507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1320431493 and 1320431502.

It is not an unprimeable number, because it can be changed into a prime (1320431513) 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, 220071918 + ... + 220071923.

It is an arithmetic number, because the mean of its divisors is an integer number (440143842).

Almost surely, 2^1320431523 is an apocalyptic number.

1320431523 is a deficient number, since it is larger than the sum of its proper divisors (440143845).

1320431523 is an equidigital number, since it uses as much as digits as its factorization.

1320431523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440143844.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 1320431523 is about 36337.7424037322. The cubic root of 1320431523 is about 1097.0808338356.

Adding to 1320431523 its reverse (3251340231), we get a palindrome (4571771754).

The spelling of 1320431523 in words is "one billion, three hundred twenty million, four hundred thirty-one thousand, five hundred twenty-three".