13331257 has 4 divisors (see below), whose sum is σ = 13338880. Its totient is φ = 13323636.

The previous prime is 13331251. The next prime is 13331287. The reversal of 13331257 is 75213331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13331257 - 2¹⁵ = 13298489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13331251) 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, 268 + ... + 5170.

It is an arithmetic number, because the mean of its divisors is an integer number (3334720).

Almost surely, 2^13331257 is an apocalyptic number.

It is an amenable number.

13331257 is a deficient number, since it is larger than the sum of its proper divisors (7623).

13331257 is an equidigital number, since it uses as much as digits as its factorization.

13331257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7622.

The product of its digits is 1890, while the sum is 25.

The square root of 13331257 is about 3651.1993919807. The cubic root of 13331257 is about 237.1139108335.

Adding to 13331257 its reverse (75213331), we get a palindrome (88544588).

The spelling of 13331257 in words is "thirteen million, three hundred thirty-one thousand, two hundred fifty-seven".