172512017 has 4 divisors (see below), whose sum is σ = 172550196. Its totient is φ = 172473840.

The previous prime is 172511959. The next prime is 172512023. The reversal of 172512017 is 710215271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 151019521 + 21492496 = 12289^2 + 4636^2 .

It is a cyclic number.

It is not a de Polignac number, because 172512017 - 2⁶ = 172511953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172512917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11234 + ... + 21707.

It is an arithmetic number, because the mean of its divisors is an integer number (43137549).

Almost surely, 2^172512017 is an apocalyptic number.

It is an amenable number.

172512017 is a deficient number, since it is larger than the sum of its proper divisors (38179).

172512017 is an equidigital number, since it uses as much as digits as its factorization.

172512017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38178.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 172512017 is about 13134.3830079681. The cubic root of 172512017 is about 556.6810669937.

Adding to 172512017 its reverse (710215271), we get a palindrome (882727288).

The spelling of 172512017 in words is "one hundred seventy-two million, five hundred twelve thousand, seventeen".