13657481 has 4 divisors (see below), whose sum is σ = 13861392. Its totient is φ = 13453572.

The previous prime is 13657471. The next prime is 13657487. The reversal of 13657481 is 18475631.

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 13657481 - 2²² = 9463177 is a prime.

It is a super-2 number, since 2×13657481² = 373053574530722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13657487) 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, 101855 + ... + 101988.

It is an arithmetic number, because the mean of its divisors is an integer number (3465348).

Almost surely, 2^13657481 is an apocalyptic number.

It is an amenable number.

13657481 is a deficient number, since it is larger than the sum of its proper divisors (203911).

13657481 is an equidigital number, since it uses as much as digits as its factorization.

13657481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203910.

The product of its digits is 20160, while the sum is 35.

The square root of 13657481 is about 3695.6029278049. The cubic root of 13657481 is about 239.0324530081.

The spelling of 13657481 in words is "thirteen million, six hundred fifty-seven thousand, four hundred eighty-one".