171521055 has 12 divisors (see below), whose sum is σ = 297303240. Its totient is φ = 91477872.

The previous prime is 171521027. The next prime is 171521057. The reversal of 171521055 is 550125171.

171521055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 171521055 - 2¹⁶ = 171455519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171521057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1905745 + ... + 1905834.

It is an arithmetic number, because the mean of its divisors is an integer number (24775270).

Almost surely, 2^171521055 is an apocalyptic number.

171521055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

171521055 is a deficient number, since it is larger than the sum of its proper divisors (125782185).

171521055 is a wasteful number, since it uses less digits than its factorization.

171521055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3811590 (or 3811587 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 27.

The square root of 171521055 is about 13096.6047126727. The cubic root of 171521055 is about 555.6131038089.

The spelling of 171521055 in words is "one hundred seventy-one million, five hundred twenty-one thousand, fifty-five".