12320531 has 4 divisors (see below), whose sum is σ = 12969000. Its totient is φ = 11672064.

The previous prime is 12320507. The next prime is 12320549. The reversal of 12320531 is 13502321.

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 12320531 - 2²² = 8126227 is a prime.

It is a super-2 number, since 2×12320531² = 303590968243922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12320431) 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, 324206 + ... + 324243.

It is an arithmetic number, because the mean of its divisors is an integer number (3242250).

Almost surely, 2^12320531 is an apocalyptic number.

12320531 is a deficient number, since it is larger than the sum of its proper divisors (648469).

12320531 is an equidigital number, since it uses as much as digits as its factorization.

12320531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648468.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 12320531 is about 3510.0613954744. The cubic root of 12320531 is about 230.9633881870.

Adding to 12320531 its reverse (13502321), we get a palindrome (25822852).

The spelling of 12320531 in words is "twelve million, three hundred twenty thousand, five hundred thirty-one".