171129720 has 32 divisors (see below), whose sum is σ = 513389520. Its totient is φ = 45634560.

The previous prime is 171129709. The next prime is 171129731. The reversal of 171129720 is 27921171.

It is a happy number.

171129720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (171129709) and next prime (171129731).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712921 + ... + 713160.

Almost surely, 2^171129720 is an apocalyptic number.

171129720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

171129720 is an abundant number, since it is smaller than the sum of its proper divisors (342259800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171129720 is a wasteful number, since it uses less digits than its factorization.

171129720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426095 (or 1426091 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 30.

The square root of 171129720 is about 13081.6558584913. The cubic root of 171129720 is about 555.1902277871.

The spelling of 171129720 in words is "one hundred seventy-one million, one hundred twenty-nine thousand, seven hundred twenty".