171121341511 has 4 divisors (see below), whose sum is σ = 171136468224. Its totient is φ = 171106214800.

The previous prime is 171121341509. The next prime is 171121341553. The reversal of 171121341511 is 115143121171.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 171121341511 - 2¹ = 171121341509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 171121341511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171121341571) 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, 7546375 + ... + 7569016.

It is an arithmetic number, because the mean of its divisors is an integer number (42784117056).

Almost surely, 2^171121341511 is an apocalyptic number.

171121341511 is a deficient number, since it is larger than the sum of its proper divisors (15126713).

171121341511 is a wasteful number, since it uses less digits than its factorization.

171121341511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15126712.

The product of its digits is 840, while the sum is 28.

Adding to 171121341511 its reverse (115143121171), we get a palindrome (286264462682).

The spelling of 171121341511 in words is "one hundred seventy-one billion, one hundred twenty-one million, three hundred forty-one thousand, five hundred eleven".