13105551 has 8 divisors (see below), whose sum is σ = 17550000. Its totient is φ = 8699072.

The previous prime is 13105549. The next prime is 13105567. The reversal of 13105551 is 15550131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13105551 - 2¹ = 13105549 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13105501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8676 + ... + 10073.

It is an arithmetic number, because the mean of its divisors is an integer number (2193750).

Almost surely, 2^13105551 is an apocalyptic number.

13105551 is a deficient number, since it is larger than the sum of its proper divisors (4444449).

13105551 is a wasteful number, since it uses less digits than its factorization.

13105551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18985.

The product of its (nonzero) digits is 375, while the sum is 21.

The square root of 13105551 is about 3620.1589744098. The cubic root of 13105551 is about 235.7681278552.

Adding to 13105551 its reverse (15550131), we get a palindrome (28655682).

The spelling of 13105551 in words is "thirteen million, one hundred five thousand, five hundred fifty-one".