172303121 has 4 divisors (see below), whose sum is σ = 173618544. Its totient is φ = 170987700.

The previous prime is 172303099. The next prime is 172303129. The reversal of 172303121 is 121303271.

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 a de Polignac number, because none of the positive numbers 2^k-172303121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172303093 and 172303102.

It is not an unprimeable number, because it can be changed into a prime (172303129) 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, 657515 + ... + 657776.

It is an arithmetic number, because the mean of its divisors is an integer number (43404636).

Almost surely, 2^172303121 is an apocalyptic number.

It is an amenable number.

172303121 is a deficient number, since it is larger than the sum of its proper divisors (1315423).

172303121 is a wasteful number, since it uses less digits than its factorization.

172303121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315422.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 172303121 is about 13126.4283413273. The cubic root of 172303121 is about 556.4562799133.

Adding to 172303121 its reverse (121303271), we get a palindrome (293606392).

The spelling of 172303121 in words is "one hundred seventy-two million, three hundred three thousand, one hundred twenty-one".