164722237 has 4 divisors (see below), whose sum is σ = 166978780. Its totient is φ = 162465696.

The previous prime is 164722223. The next prime is 164722273. The reversal of 164722237 is 732227461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 732227461 = 7 ⋅104603923.

It can be written as a sum of positive squares in 2 ways, for example, as 113656921 + 51065316 = 10661^2 + 7146^2 .

It is a cyclic number.

It is not a de Polignac number, because 164722237 - 2¹⁹ = 164197949 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 (164729237) 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, 1128162 + ... + 1128307.

It is an arithmetic number, because the mean of its divisors is an integer number (41744695).

Almost surely, 2^164722237 is an apocalyptic number.

It is an amenable number.

164722237 is a deficient number, since it is larger than the sum of its proper divisors (2256543).

164722237 is an equidigital number, since it uses as much as digits as its factorization.

164722237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256542.

The product of its digits is 28224, while the sum is 34.

The square root of 164722237 is about 12834.4161144947. The cubic root of 164722237 is about 548.1727093842.

Adding to 164722237 its reverse (732227461), we get a palindrome (896949698).

The spelling of 164722237 in words is "one hundred sixty-four million, seven hundred twenty-two thousand, two hundred thirty-seven".