13500551 has 2 divisors, whose sum is σ = 13500552. Its totient is φ = 13500550.

The previous prime is 13500493. The next prime is 13500589. The reversal of 13500551 is 15500531.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (15500531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13500551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13500451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6750275 + 6750276.

It is an arithmetic number, because the mean of its divisors is an integer number (6750276).

Almost surely, 2^13500551 is an apocalyptic number.

13500551 is a deficient number, since it is larger than the sum of its proper divisors (1).

13500551 is an equidigital number, since it uses as much as digits as its factorization.

13500551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 375, while the sum is 20.

The square root of 13500551 is about 3674.3095950124. The cubic root of 13500551 is about 238.1133972252.

Subtracting from 13500551 its sum of digits (20), we obtain a palindrome (13500531).

The spelling of 13500551 in words is "thirteen million, five hundred thousand, five hundred fifty-one".