172251117 has 20 divisors (see below), whose sum is σ = 268503840. Its totient is φ = 109840104.

The previous prime is 172251109. The next prime is 172251119. The reversal of 172251117 is 711152271.

It is not a de Polignac number, because 172251117 - 2³ = 172251109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172251119) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 44367 + ... + 48092.

It is an arithmetic number, because the mean of its divisors is an integer number (13425192).

Almost surely, 2^172251117 is an apocalyptic number.

It is an amenable number.

172251117 is a deficient number, since it is larger than the sum of its proper divisors (96252723).

172251117 is an equidigital number, since it uses as much as digits as its factorization.

172251117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92494 (or 92485 counting only the distinct ones).

The product of its digits is 980, while the sum is 27.

The square root of 172251117 is about 13124.4473026486. The cubic root of 172251117 is about 556.4002916371.

The spelling of 172251117 in words is "one hundred seventy-two million, two hundred fifty-one thousand, one hundred seventeen".