13216457 has 4 divisors (see below), whose sum is σ = 13912080. Its totient is φ = 12520836.

The previous prime is 13216433. The next prime is 13216477. The reversal of 13216457 is 75461231.

13216457 is digitally balanced in base 2, because in such base 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.

It is a cyclic number.

It is not a de Polignac number, because 13216457 - 2⁸ = 13216201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13216477) 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, 347783 + ... + 347820.

It is an arithmetic number, because the mean of its divisors is an integer number (3478020).

Almost surely, 2^13216457 is an apocalyptic number.

It is an amenable number.

13216457 is a deficient number, since it is larger than the sum of its proper divisors (695623).

13216457 is an equidigital number, since it uses as much as digits as its factorization.

13216457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695622.

The product of its digits is 5040, while the sum is 29.

The square root of 13216457 is about 3635.4445395302. Note that the first 3 decimals coincide. The cubic root of 13216457 is about 236.4313248268.

Adding to 13216457 its reverse (75461231), we get a palindrome (88677688).

The spelling of 13216457 in words is "thirteen million, two hundred sixteen thousand, four hundred fifty-seven".