172213337 has 2 divisors, whose sum is σ = 172213338. Its totient is φ = 172213336.

The previous prime is 172213333. The next prime is 172213343. The reversal of 172213337 is 733312271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171374281 + 839056 = 13091^2 + 916^2 .

It is an emirp because it is prime and its reverse (733312271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172213337 - 2² = 172213333 is a prime.

It is not a weakly prime, because it can be changed into another prime (172213333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86106668 + 86106669.

It is an arithmetic number, because the mean of its divisors is an integer number (86106669).

Almost surely, 2^172213337 is an apocalyptic number.

It is an amenable number.

172213337 is a deficient number, since it is larger than the sum of its proper divisors (1).

172213337 is an equidigital number, since it uses as much as digits as its factorization.

172213337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 29.

The square root of 172213337 is about 13123.0079250148. The cubic root of 172213337 is about 556.3596100624.

The spelling of 172213337 in words is "one hundred seventy-two million, two hundred thirteen thousand, three hundred thirty-seven".