164243231 has 4 divisors (see below), whose sum is σ = 164598432. Its totient is φ = 163888032.

The previous prime is 164243227. The next prime is 164243243. The reversal of 164243231 is 132342461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132342461 = 599 ⋅220939.

It is a cyclic number.

It is not a de Polignac number, because 164243231 - 2² = 164243227 is a prime.

It is a super-2 number, since 2×164243231² = 53951677858638722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164243231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164243221) 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, 176906 + ... + 177831.

It is an arithmetic number, because the mean of its divisors is an integer number (41149608).

Almost surely, 2^164243231 is an apocalyptic number.

164243231 is a deficient number, since it is larger than the sum of its proper divisors (355201).

164243231 is an equidigital number, since it uses as much as digits as its factorization.

164243231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355200.

The product of its digits is 3456, while the sum is 26.

The square root of 164243231 is about 12815.7415314136. The cubic root of 164243231 is about 547.6408383673.

Adding to 164243231 its reverse (132342461), we get a palindrome (296585692).

The spelling of 164243231 in words is "one hundred sixty-four million, two hundred forty-three thousand, two hundred thirty-one".