13147257 has 4 divisors (see below), whose sum is σ = 17529680. Its totient is φ = 8764836.

The previous prime is 13147249. The next prime is 13147261. The reversal of 13147257 is 75274131.

13147257 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 an emirpimes, since its reverse is a distinct semiprime: 75274131 = 3 ⋅25091377.

It is not a de Polignac number, because 13147257 - 2³ = 13147249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13147217) 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, 2191207 + ... + 2191212.

It is an arithmetic number, because the mean of its divisors is an integer number (4382420).

Almost surely, 2^13147257 is an apocalyptic number.

It is an amenable number.

13147257 is a deficient number, since it is larger than the sum of its proper divisors (4382423).

13147257 is an equidigital number, since it uses as much as digits as its factorization.

13147257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4382422.

The product of its digits is 5880, while the sum is 30.

The square root of 13147257 is about 3625.9146432314. The cubic root of 13147257 is about 236.0179592289.

The spelling of 13147257 in words is "thirteen million, one hundred forty-seven thousand, two hundred fifty-seven".