171788113451 has 4 divisors (see below), whose sum is σ = 172022477232. Its totient is φ = 171553749672.

The previous prime is 171788113391. The next prime is 171788113477. The reversal of 171788113451 is 154311887171.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171788113451 is a prime.

It is a super-2 number, since 2×171788113451² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 171788113396 and 171788113405.

It is not an unprimeable number, because it can be changed into a prime (171788113051) 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, 117180791 + ... + 117182256.

It is an arithmetic number, because the mean of its divisors is an integer number (43005619308).

Almost surely, 2^171788113451 is an apocalyptic number.

171788113451 is a deficient number, since it is larger than the sum of its proper divisors (234363781).

171788113451 is an equidigital number, since it uses as much as digits as its factorization.

171788113451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234363780.

The product of its digits is 188160, while the sum is 47.

The spelling of 171788113451 in words is "one hundred seventy-one billion, seven hundred eighty-eight million, one hundred thirteen thousand, four hundred fifty-one".