172113113 has 4 divisors (see below), whose sum is σ = 174291840. Its totient is φ = 169934388.

The previous prime is 172113079. The next prime is 172113127. The reversal of 172113113 is 311311271.

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.

It is a cyclic number.

It is not a de Polignac number, because 172113113 - 2¹² = 172109017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172113143) 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 3 ways as a sum of consecutive naturals, for example, 1089245 + ... + 1089402.

It is an arithmetic number, because the mean of its divisors is an integer number (43572960).

Almost surely, 2^172113113 is an apocalyptic number.

It is an amenable number.

172113113 is a deficient number, since it is larger than the sum of its proper divisors (2178727).

172113113 is an equidigital number, since it uses as much as digits as its factorization.

172113113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178726.

The product of its digits is 126, while the sum is 20.

The square root of 172113113 is about 13119.1887325398. The cubic root of 172113113 is about 556.2516598360.

Adding to 172113113 its reverse (311311271), we get a palindrome (483424384).

The spelling of 172113113 in words is "one hundred seventy-two million, one hundred thirteen thousand, one hundred thirteen".