13228531 has 2 divisors, whose sum is σ = 13228532. Its totient is φ = 13228530.

The previous prime is 13228529. The next prime is 13228577. The reversal of 13228531 is 13582231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13228531 - 2¹ = 13228529 is a prime.

It is a super-2 number, since 2×13228531² = 349988064835922, which contains 22 as substring.

Together with 13228529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13228496 and 13228505.

It is not a weakly prime, because it can be changed into another prime (13226531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6614265 + 6614266.

It is an arithmetic number, because the mean of its divisors is an integer number (6614266).

Almost surely, 2^13228531 is an apocalyptic number.

13228531 is a deficient number, since it is larger than the sum of its proper divisors (1).

13228531 is an equidigital number, since it uses as much as digits as its factorization.

13228531 is an odious number, because the sum of its binary digits is odd.

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

The square root of 13228531 is about 3637.1047551590. The cubic root of 13228531 is about 236.5033008224.

The spelling of 13228531 in words is "thirteen million, two hundred twenty-eight thousand, five hundred thirty-one".