15505543 has 2 divisors, whose sum is σ = 15505544. Its totient is φ = 15505542.

The previous prime is 15505541. The next prime is 15505561. The reversal of 15505543 is 34550551.

15505543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15505543 - 2¹ = 15505541 is a prime.

Together with 15505541, it forms a pair of twin primes.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15505541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7752771 + 7752772.

It is an arithmetic number, because the mean of its divisors is an integer number (7752772).

Almost surely, 2^15505543 is an apocalyptic number.

15505543 is a deficient number, since it is larger than the sum of its proper divisors (1).

15505543 is an equidigital number, since it uses as much as digits as its factorization.

15505543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 15505543 is about 3937.7078357847. The cubic root of 15505543 is about 249.3612654626.

The spelling of 15505543 in words is "fifteen million, five hundred five thousand, five hundred forty-three".