13136257 has 4 divisors (see below), whose sum is σ = 13908996. Its totient is φ = 12363520.

The previous prime is 13136251. The next prime is 13136267. The reversal of 13136257 is 75263131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6780816 + 6355441 = 2604^2 + 2521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13136257 is a prime.

It is a super-2 number, since 2×13136257² = 345122495940098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13136251) 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, 386344 + ... + 386377.

It is an arithmetic number, because the mean of its divisors is an integer number (3477249).

Almost surely, 2^13136257 is an apocalyptic number.

13136257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13136257 is a deficient number, since it is larger than the sum of its proper divisors (772739).

13136257 is an equidigital number, since it uses as much as digits as its factorization.

13136257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772738.

The product of its digits is 3780, while the sum is 28.

The square root of 13136257 is about 3624.3974671661. The cubic root of 13136257 is about 235.9521173085.

Adding to 13136257 its reverse (75263131), we get a palindrome (88399388).

The spelling of 13136257 in words is "thirteen million, one hundred thirty-six thousand, two hundred fifty-seven".