171989056 has 14 divisors (see below), whose sum is σ = 341290910. Its totient is φ = 85994496.

The previous prime is 171989039. The next prime is 171989057. The reversal of 171989056 is 650989171.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 152769600 + 19219456 = 12360^2 + 4384^2 .

It is a super-2 number, since 2×171989056² = 59160470767542272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 171988997 and 171989015.

It is not an unprimeable number, because it can be changed into a prime (171989057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343601 + ... + 1343728.

Almost surely, 2^171989056 is an apocalyptic number.

171989056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

171989056 is a deficient number, since it is larger than the sum of its proper divisors (169301854).

171989056 is an equidigital number, since it uses as much as digits as its factorization.

171989056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687341 (or 2687331 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 171989056 is about 13114.4598058784. The cubic root of 171989056 is about 556.1179812774.

The spelling of 171989056 in words is "one hundred seventy-one million, nine hundred eighty-nine thousand, fifty-six".