13215553 has 4 divisors (see below), whose sum is σ = 14232148. Its totient is φ = 12198960.

The previous prime is 13215541. The next prime is 13215569. The reversal of 13215553 is 35551231.

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 6697744 + 6517809 = 2588^2 + 2553^2 .

It is a cyclic number.

It is not a de Polignac number, because 13215553 - 2¹³ = 13207361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13215533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508278 + ... + 508303.

It is an arithmetic number, because the mean of its divisors is an integer number (3558037).

Almost surely, 2^13215553 is an apocalyptic number.

13215553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

13215553 is a deficient number, since it is larger than the sum of its proper divisors (1016595).

13215553 is a wasteful number, since it uses less digits than its factorization.

13215553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016594.

The product of its digits is 2250, while the sum is 25.

The square root of 13215553 is about 3635.3202059791. The cubic root of 13215553 is about 236.4259341034.

Adding to 13215553 its reverse (35551231), we get a palindrome (48766784).

The spelling of 13215553 in words is "thirteen million, two hundred fifteen thousand, five hundred fifty-three".