13551551 has 4 divisors (see below), whose sum is σ = 14593992. Its totient is φ = 12509112.

The previous prime is 13551529. The next prime is 13551563. The reversal of 13551551 is 15515531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15515531 = 31 ⋅500501.

It is a cyclic number.

It is not a de Polignac number, because 13551551 - 2¹⁴ = 13535167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13551551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13551511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521201 + ... + 521226.

It is an arithmetic number, because the mean of its divisors is an integer number (3648498).

Almost surely, 2^13551551 is an apocalyptic number.

13551551 is a deficient number, since it is larger than the sum of its proper divisors (1042441).

13551551 is a wasteful number, since it uses less digits than its factorization.

13551551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042440.

The product of its digits is 1875, while the sum is 26.

The square root of 13551551 is about 3681.2431324214. The cubic root of 13551551 is about 238.4128547244.

The spelling of 13551551 in words is "thirteen million, five hundred fifty-one thousand, five hundred fifty-one".