172216843 has 2 divisors, whose sum is σ = 172216844. Its totient is φ = 172216842.

The previous prime is 172216841. The next prime is 172216909. The reversal of 172216843 is 348612271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172216843 - 2¹ = 172216841 is a prime.

Together with 172216841, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 172216799 and 172216808.

It is not a weakly prime, because it can be changed into another prime (172216841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86108421 + 86108422.

It is an arithmetic number, because the mean of its divisors is an integer number (86108422).

Almost surely, 2^172216843 is an apocalyptic number.

172216843 is a deficient number, since it is larger than the sum of its proper divisors (1).

172216843 is an equidigital number, since it uses as much as digits as its factorization.

172216843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 172216843 is about 13123.1415065144. The cubic root of 172216843 is about 556.3633855802.

The spelling of 172216843 in words is "one hundred seventy-two million, two hundred sixteen thousand, eight hundred forty-three".