172271213 has 2 divisors, whose sum is σ = 172271214. Its totient is φ = 172271212.

The previous prime is 172271207. The next prime is 172271243. The reversal of 172271213 is 312172271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166229449 + 6041764 = 12893^2 + 2458^2 .

It is an emirp because it is prime and its reverse (312172271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172271213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172271243) 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 as a sum of consecutive naturals, namely, 86135606 + 86135607.

It is an arithmetic number, because the mean of its divisors is an integer number (86135607).

Almost surely, 2^172271213 is an apocalyptic number.

It is an amenable number.

172271213 is a deficient number, since it is larger than the sum of its proper divisors (1).

172271213 is an equidigital number, since it uses as much as digits as its factorization.

172271213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1176, while the sum is 26.

The square root of 172271213 is about 13125.2128744642. The cubic root of 172271213 is about 556.4219286239.

The spelling of 172271213 in words is "one hundred seventy-two million, two hundred seventy-one thousand, two hundred thirteen".