172820059 has 4 divisors (see below), whose sum is σ = 173210616. Its totient is φ = 172429504.

The previous prime is 172820057. The next prime is 172820069. The reversal of 172820059 is 950028271.

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 172820059 - 2¹ = 172820057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172820057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194614 + ... + 195499.

It is an arithmetic number, because the mean of its divisors is an integer number (43302654).

Almost surely, 2^172820059 is an apocalyptic number.

172820059 is a deficient number, since it is larger than the sum of its proper divisors (390557).

172820059 is an equidigital number, since it uses as much as digits as its factorization.

172820059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390556.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 172820059 is about 13146.1043278988. The cubic root of 172820059 is about 557.0122114289.

The spelling of 172820059 in words is "one hundred seventy-two million, eight hundred twenty thousand, fifty-nine".