164521543 has 2 divisors, whose sum is σ = 164521544. Its totient is φ = 164521542.

The previous prime is 164521541. The next prime is 164521547. The reversal of 164521543 is 345125461.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (345125461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164521543 - 2¹ = 164521541 is a prime.

It is a super-2 number, since 2×164521543² = 54134676222201698, which contains 22 as substring.

Together with 164521541, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164521541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82260771 + 82260772.

It is an arithmetic number, because the mean of its divisors is an integer number (82260772).

Almost surely, 2^164521543 is an apocalyptic number.

164521543 is a deficient number, since it is larger than the sum of its proper divisors (1).

164521543 is an equidigital number, since it uses as much as digits as its factorization.

164521543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

The square root of 164521543 is about 12826.5951444645. The cubic root of 164521543 is about 547.9499916626.

The spelling of 164521543 in words is "one hundred sixty-four million, five hundred twenty-one thousand, five hundred forty-three".