164531 has 2 divisors, whose sum is σ = 164532. Its totient is φ = 164530.

The previous prime is 164513. The next prime is 164569. The reversal of 164531 is 135461.

Together with previous prime (164513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (135461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164531 - 2¹⁴ = 148147 is a prime.

It is a super-2 number, since 2×164531² = 54140899922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (164581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82265 + 82266.

It is an arithmetic number, because the mean of its divisors is an integer number (82266).

2¹⁶⁴⁵³¹ is an apocalyptic number.

164531 is a deficient number, since it is larger than the sum of its proper divisors (1).

164531 is an equidigital number, since it uses as much as digits as its factorization.

164531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 20.

The square root of 164531 is about 405.6242103228. The cubic root of 164531 is about 54.7960490518.

Adding to 164531 its reverse (135461), we get a palindrome (299992).

The spelling of 164531 in words is "one hundred sixty-four thousand, five hundred thirty-one".