13257681 has 8 divisors (see below), whose sum is σ = 17804640. Its totient is φ = 8774592.

The previous prime is 13257659. The next prime is 13257689. The reversal of 13257681 is 18675231.

13257681 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 sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13257681 - 2¹⁰ = 13256657 is a prime.

It is a super-2 number, since 2×13257681² = 351532210995522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13257689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15480 + ... + 16313.

It is an arithmetic number, because the mean of its divisors is an integer number (2225580).

Almost surely, 2^13257681 is an apocalyptic number.

It is an amenable number.

13257681 is a deficient number, since it is larger than the sum of its proper divisors (4546959).

13257681 is a wasteful number, since it uses less digits than its factorization.

13257681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31935.

The product of its digits is 10080, while the sum is 33.

The square root of 13257681 is about 3641.1098582712. The cubic root of 13257681 is about 236.6768906073.

The spelling of 13257681 in words is "thirteen million, two hundred fifty-seven thousand, six hundred eighty-one".