13550551 has 4 divisors (see below), whose sum is σ = 15486352. Its totient is φ = 11614752.

The previous prime is 13550539. The next prime is 13550557. The reversal of 13550551 is 15505531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15505531 = 2081 ⋅7451.

It is a cyclic number.

It is not a de Polignac number, because 13550551 - 2⁹ = 13550039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13550557) 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, 967890 + ... + 967903.

It is an arithmetic number, because the mean of its divisors is an integer number (3871588).

Almost surely, 2^13550551 is an apocalyptic number.

13550551 is a deficient number, since it is larger than the sum of its proper divisors (1935801).

13550551 is an equidigital number, since it uses as much as digits as its factorization.

13550551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935800.

The product of its (nonzero) digits is 1875, while the sum is 25.

The square root of 13550551 is about 3681.1073062327. The cubic root of 13550551 is about 238.4069902365.

It can be divided in two parts, 13 and 550551, that added together give a square (550564 = 742²).

The spelling of 13550551 in words is "thirteen million, five hundred fifty thousand, five hundred fifty-one".