13911551 has 4 divisors (see below), whose sum is σ = 14147400. Its totient is φ = 13675704.

The previous prime is 13911539. The next prime is 13911571. The reversal of 13911551 is 15511931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13911551 - 2⁶ = 13911487 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 13911551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13911511) 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, 117836 + ... + 117953.

It is an arithmetic number, because the mean of its divisors is an integer number (3536850).

Almost surely, 2^13911551 is an apocalyptic number.

13911551 is a deficient number, since it is larger than the sum of its proper divisors (235849).

13911551 is an equidigital number, since it uses as much as digits as its factorization.

13911551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235848.

The product of its digits is 675, while the sum is 26.

The square root of 13911551 is about 3729.8191645172. The cubic root of 13911551 is about 240.5055950220.

The spelling of 13911551 in words is "thirteen million, nine hundred eleven thousand, five hundred fifty-one".