171071725121 has 4 divisors (see below), whose sum is σ = 186623700144. Its totient is φ = 155519750100.

The previous prime is 171071725109. The next prime is 171071725127. The reversal of 171071725121 is 121527170171.

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 not a de Polignac number, because 171071725121 - 2¹⁴ = 171071708737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171071725127) 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, 7775987495 + ... + 7775987516.

It is an arithmetic number, because the mean of its divisors is an integer number (46655925036).

Almost surely, 2^171071725121 is an apocalyptic number.

171071725121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

171071725121 is a deficient number, since it is larger than the sum of its proper divisors (15551975023).

171071725121 is a wasteful number, since it uses less digits than its factorization.

171071725121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15551975022.

The product of its (nonzero) digits is 6860, while the sum is 35.

Adding to 171071725121 its reverse (121527170171), we get a palindrome (292598895292).

The spelling of 171071725121 in words is "one hundred seventy-one billion, seventy-one million, seven hundred twenty-five thousand, one hundred twenty-one".