171521053 has 4 divisors (see below), whose sum is σ = 187113888. Its totient is φ = 155928220.

The previous prime is 171521027. The next prime is 171521057. The reversal of 171521053 is 350125171.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171521053 is a prime.

It is a Duffinian number.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7796401 + ... + 7796422.

It is an arithmetic number, because the mean of its divisors is an integer number (46778472).

Almost surely, 2^171521053 is an apocalyptic number.

It is an amenable number.

171521053 is a deficient number, since it is larger than the sum of its proper divisors (15592835).

171521053 is a wasteful number, since it uses less digits than its factorization.

171521053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15592834.

The product of its (nonzero) digits is 1050, while the sum is 25.

The square root of 171521053 is about 13096.6046363170. The cubic root of 171521053 is about 555.6131016494.

The spelling of 171521053 in words is "one hundred seventy-one million, five hundred twenty-one thousand, fifty-three".