13331557 has 2 divisors, whose sum is σ = 13331558. Its totient is φ = 13331556.

The previous prime is 13331533. The next prime is 13331569. The reversal of 13331557 is 75513331.

13331557 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10556001 + 2775556 = 3249^2 + 1666^2 .

It is an emirp because it is prime and its reverse (75513331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13331557 - 2⁷ = 13331429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13331957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6665778 + 6665779.

It is an arithmetic number, because the mean of its divisors is an integer number (6665779).

Almost surely, 2^13331557 is an apocalyptic number.

It is an amenable number.

13331557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13331557 is an equidigital number, since it uses as much as digits as its factorization.

13331557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4725, while the sum is 28.

The square root of 13331557 is about 3651.2404741403. The cubic root of 13331557 is about 237.1156894514.

Adding to 13331557 its reverse (75513331), we get a palindrome (88844888).

The spelling of 13331557 in words is "thirteen million, three hundred thirty-one thousand, five hundred fifty-seven".