164421533 has 2 divisors, whose sum is σ = 164421534. Its totient is φ = 164421532.

The previous prime is 164421511. The next prime is 164421541. The reversal of 164421533 is 335124461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164301124 + 120409 = 12818^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 164421533 - 2⁶ = 164421469 is a prime.

It is a super-3 number, since 3×164421533³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 164421496 and 164421505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164421553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82210766 + 82210767.

It is an arithmetic number, because the mean of its divisors is an integer number (82210767).

Almost surely, 2^164421533 is an apocalyptic number.

It is an amenable number.

164421533 is a deficient number, since it is larger than the sum of its proper divisors (1).

164421533 is an equidigital number, since it uses as much as digits as its factorization.

164421533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 164421533 is about 12822.6960113698. The cubic root of 164421533 is about 547.8389391615.

Adding to 164421533 its reverse (335124461), we get a palindrome (499545994).

The spelling of 164421533 in words is "one hundred sixty-four million, four hundred twenty-one thousand, five hundred thirty-three".