172108505 has 8 divisors (see below), whose sum is σ = 206619072. Its totient is φ = 137627568.

The previous prime is 172108499. The next prime is 172108513. The reversal of 172108505 is 505801271.

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 172108505 - 2¹⁴ = 172092121 is a prime.

It is a Duffinian 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, 8474 + ... + 20396.

It is an arithmetic number, because the mean of its divisors is an integer number (25827384).

Almost surely, 2^172108505 is an apocalyptic number.

It is an amenable number.

172108505 is a deficient number, since it is larger than the sum of its proper divisors (34510567).

172108505 is a wasteful number, since it uses less digits than its factorization.

172108505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14815.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 172108505 is about 13119.0131107488. The cubic root of 172108505 is about 556.2466955996.

Adding to 172108505 its reverse (505801271), we get a palindrome (677909776).

The spelling of 172108505 in words is "one hundred seventy-two million, one hundred eight thousand, five hundred five".