172643117 has 8 divisors (see below), whose sum is σ = 173987352. Its totient is φ = 171304000.

The previous prime is 172643111. The next prime is 172643137. The reversal of 172643117 is 711346271.

It can be written as a sum of positive squares in 4 ways, for example, as 23290276 + 149352841 = 4826^2 + 12221^2 .

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 172643117 - 2⁸ = 172642861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172643111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89867 + ... + 91767.

It is an arithmetic number, because the mean of its divisors is an integer number (21748419).

Almost surely, 2^172643117 is an apocalyptic number.

It is an amenable number.

172643117 is a deficient number, since it is larger than the sum of its proper divisors (1344235).

172643117 is a wasteful number, since it uses less digits than its factorization.

172643117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2559.

The product of its digits is 7056, while the sum is 32.

The square root of 172643117 is about 13139.3727780286. The cubic root of 172643117 is about 556.8220473338.

Adding to 172643117 its reverse (711346271), we get a palindrome (883989388).

The spelling of 172643117 in words is "one hundred seventy-two million, six hundred forty-three thousand, one hundred seventeen".