12823531 has 4 divisors (see below), whose sum is σ = 14655472. Its totient is φ = 10991592.

The previous prime is 12823519. The next prime is 12823541. The reversal of 12823531 is 13532821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13532821 = 29 ⋅466649.

It is a cyclic number.

It is not a de Polignac number, because 12823531 - 2¹⁵ = 12790763 is a prime.

It is a super-2 number, since 2×12823531² = 328885894615922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12823496 and 12823505.

It is not an unprimeable number, because it can be changed into a prime (12823511) 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, 915960 + ... + 915973.

It is an arithmetic number, because the mean of its divisors is an integer number (3663868).

Almost surely, 2^12823531 is an apocalyptic number.

12823531 is a deficient number, since it is larger than the sum of its proper divisors (1831941).

12823531 is an equidigital number, since it uses as much as digits as its factorization.

12823531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831940.

The product of its digits is 1440, while the sum is 25.

The square root of 12823531 is about 3580.9958112235. The cubic root of 12823531 is about 234.0646751854.

It can be divided in two parts, 12 and 823531, that added together give a 7-th power (823543 = 7⁷).

The spelling of 12823531 in words is "twelve million, eight hundred twenty-three thousand, five hundred thirty-one".