172785113 has 4 divisors (see below), whose sum is σ = 176461440. Its totient is φ = 169108788.

The previous prime is 172785091. The next prime is 172785139. The reversal of 172785113 is 311587271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 311587271 = 17 ⋅18328663.

It is a cyclic number.

It is not a de Polignac number, because 172785113 - 2¹⁸ = 172522969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172785143) 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, 1838093 + ... + 1838186.

It is an arithmetic number, because the mean of its divisors is an integer number (44115360).

Almost surely, 2^172785113 is an apocalyptic number.

It is an amenable number.

172785113 is a deficient number, since it is larger than the sum of its proper divisors (3676327).

172785113 is an equidigital number, since it uses as much as digits as its factorization.

172785113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3676326.

The product of its digits is 11760, while the sum is 35.

The square root of 172785113 is about 13144.7751216976. The cubic root of 172785113 is about 556.9746643582.

The spelling of 172785113 in words is "one hundred seventy-two million, seven hundred eighty-five thousand, one hundred thirteen".