164743121 has 2 divisors, whose sum is σ = 164743122. Its totient is φ = 164743120.

The previous prime is 164743099. The next prime is 164743147. The reversal of 164743121 is 121347461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123321025 + 41422096 = 11105^2 + 6436^2 .

It is an emirp because it is prime and its reverse (121347461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164743121 - 2⁶ = 164743057 is a prime.

It is not a weakly prime, because it can be changed into another prime (164745121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82371560 + 82371561.

It is an arithmetic number, because the mean of its divisors is an integer number (82371561).

Almost surely, 2^164743121 is an apocalyptic number.

It is an amenable number.

164743121 is a deficient number, since it is larger than the sum of its proper divisors (1).

164743121 is an equidigital number, since it uses as much as digits as its factorization.

164743121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 29.

The square root of 164743121 is about 12835.2296824015. The cubic root of 164743121 is about 548.1958747550.

The spelling of 164743121 in words is "one hundred sixty-four million, seven hundred forty-three thousand, one hundred twenty-one".