172858109 has 2 divisors, whose sum is σ = 172858110. Its totient is φ = 172858108.

The previous prime is 172858097. The next prime is 172858121. The reversal of 172858109 is 901858271.

It is a balanced prime because it is at equal distance from previous prime (172858097) and next prime (172858121).

It can be written as a sum of positive squares in only one way, i.e., 101404900 + 71453209 = 10070^2 + 8453^2 .

It is a cyclic number.

It is not a de Polignac number, because 172858109 - 2⁴ = 172858093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172858199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86429054 + 86429055.

It is an arithmetic number, because the mean of its divisors is an integer number (86429055).

Almost surely, 2^172858109 is an apocalyptic number.

It is an amenable number.

172858109 is a deficient number, since it is larger than the sum of its proper divisors (1).

172858109 is an equidigital number, since it uses as much as digits as its factorization.

172858109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 172858109 is about 13147.5514450410. The cubic root of 172858109 is about 557.0530877784.

The spelling of 172858109 in words is "one hundred seventy-two million, eight hundred fifty-eight thousand, one hundred nine".