13361557 has 4 divisors (see below), whose sum is σ = 14576256. Its totient is φ = 12146860.

The previous prime is 13361539. The next prime is 13361581. The reversal of 13361557 is 75516331.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75516331 = 11 ⋅6865121.

It is not a de Polignac number, because 13361557 - 2⁷ = 13361429 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13361587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607333 + ... + 607354.

It is an arithmetic number, because the mean of its divisors is an integer number (3644064).

Almost surely, 2^13361557 is an apocalyptic number.

It is an amenable number.

13361557 is a deficient number, since it is larger than the sum of its proper divisors (1214699).

13361557 is a wasteful number, since it uses less digits than its factorization.

13361557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214698.

The product of its digits is 9450, while the sum is 31.

The square root of 13361557 is about 3655.3463584180. The cubic root of 13361557 is about 237.2934166674.

Adding to 13361557 its reverse (75516331), we get a palindrome (88877888).

It can be divided in two parts, 133 and 61557, that multiplied together give a triangular number (8187081 = T₄₀₄₆).

The spelling of 13361557 in words is "thirteen million, three hundred sixty-one thousand, five hundred fifty-seven".