172216303 has 4 divisors (see below), whose sum is σ = 196818640. Its totient is φ = 147613968.

The previous prime is 172216259. The next prime is 172216313. The reversal of 172216303 is 303612271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 303612271 = 691 ⋅439381.

It is a cyclic number.

It is not a de Polignac number, because 172216303 - 2¹⁷ = 172085231 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 (172216313) 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, 12301158 + ... + 12301171.

It is an arithmetic number, because the mean of its divisors is an integer number (49204660).

Almost surely, 2^172216303 is an apocalyptic number.

172216303 is a deficient number, since it is larger than the sum of its proper divisors (24602337).

172216303 is an equidigital number, since it uses as much as digits as its factorization.

172216303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24602336.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 172216303 is about 13123.1209321563. The cubic root of 172216303 is about 556.3628040719.

Adding to 172216303 its reverse (303612271), we get a palindrome (475828574).

The spelling of 172216303 in words is "one hundred seventy-two million, two hundred sixteen thousand, three hundred three".