12816553 has 2 divisors, whose sum is σ = 12816554. Its totient is φ = 12816552.

The previous prime is 12816523. The next prime is 12816569. The reversal of 12816553 is 35561821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11042329 + 1774224 = 3323^2 + 1332^2 .

It is a cyclic number.

It is not a de Polignac number, because 12816553 - 2¹⁷ = 12685481 is a prime.

It is not a weakly prime, because it can be changed into another prime (12816523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6408276 + 6408277.

It is an arithmetic number, because the mean of its divisors is an integer number (6408277).

Almost surely, 2^12816553 is an apocalyptic number.

It is an amenable number.

12816553 is a deficient number, since it is larger than the sum of its proper divisors (1).

12816553 is an equidigital number, since it uses as much as digits as its factorization.

12816553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 12816553 is about 3580.0213686513. The cubic root of 12816553 is about 234.0222115911.

The spelling of 12816553 in words is "twelve million, eight hundred sixteen thousand, five hundred fifty-three".