13281257 has 4 divisors (see below), whose sum is σ = 14488656. Its totient is φ = 12073860.

The previous prime is 13281251. The next prime is 13281271. The reversal of 13281257 is 75218231.

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.

It is a cyclic number.

It is not a de Polignac number, because 13281257 - 2⁴ = 13281241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13281251) 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, 603683 + ... + 603704.

It is an arithmetic number, because the mean of its divisors is an integer number (3622164).

Almost surely, 2^13281257 is an apocalyptic number.

It is an amenable number.

13281257 is a deficient number, since it is larger than the sum of its proper divisors (1207399).

13281257 is a wasteful number, since it uses less digits than its factorization.

13281257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207398.

The product of its digits is 3360, while the sum is 29.

The square root of 13281257 is about 3644.3458946703. The cubic root of 13281257 is about 236.8171009020.

Adding to 13281257 its reverse (75218231), we get a palindrome (88499488).

The spelling of 13281257 in words is "thirteen million, two hundred eighty-one thousand, two hundred fifty-seven".