172109155 has 8 divisors (see below), whose sum is σ = 207918000. Its totient is φ = 136762656.

The previous prime is 172109153. The next prime is 172109167. The reversal of 172109155 is 551901271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172109155 - 2¹ = 172109153 is a prime.

It is a super-2 number, since 2×172109155² = 59243122469628050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172109153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114765 + ... + 116254.

It is an arithmetic number, because the mean of its divisors is an integer number (25989750).

Almost surely, 2^172109155 is an apocalyptic number.

172109155 is a deficient number, since it is larger than the sum of its proper divisors (35808845).

172109155 is a wasteful number, since it uses less digits than its factorization.

172109155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231173.

The product of its (nonzero) digits is 3150, while the sum is 31.

The square root of 172109155 is about 13119.0378839304. The cubic root of 172109155 is about 556.2473958553.

The spelling of 172109155 in words is "one hundred seventy-two million, one hundred nine thousand, one hundred fifty-five".