172100115 has 36 divisors (see below), whose sum is σ = 327901392. Its totient is φ = 83439840.

The previous prime is 172100111. The next prime is 172100161. The reversal of 172100115 is 511001271.

It is a happy number.

It is not a de Polignac number, because 172100115 - 2² = 172100111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172100111) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10359 + ... + 21248.

It is an arithmetic number, because the mean of its divisors is an integer number (9108372).

Almost surely, 2^172100115 is an apocalyptic number.

172100115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

172100115 is a deficient number, since it is larger than the sum of its proper divisors (155801277).

172100115 is a wasteful number, since it uses less digits than its factorization.

172100115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31640 (or 31626 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 18.

The square root of 172100115 is about 13118.6933419453. The cubic root of 172100115 is about 556.2376567559.

Adding to 172100115 its reverse (511001271), we get a palindrome (683101386).

The spelling of 172100115 in words is "one hundred seventy-two million, one hundred thousand, one hundred fifteen".