164238121 has 2 divisors, whose sum is σ = 164238122. Its totient is φ = 164238120.

The previous prime is 164238119. The next prime is 164238157. The reversal of 164238121 is 121832461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160376896 + 3861225 = 12664^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 164238121 - 2¹ = 164238119 is a prime.

It is a super-2 number, since 2×164238121² = 53948320779221282, which contains 22 as substring.

Together with 164238119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 164238121.

It is not a weakly prime, because it can be changed into another prime (164238721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82119060 + 82119061.

It is an arithmetic number, because the mean of its divisors is an integer number (82119061).

Almost surely, 2^164238121 is an apocalyptic number.

It is an amenable number.

164238121 is a deficient number, since it is larger than the sum of its proper divisors (1).

164238121 is an equidigital number, since it uses as much as digits as its factorization.

164238121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 28.

The square root of 164238121 is about 12815.5421656674. The cubic root of 164238121 is about 547.6351588360.

The spelling of 164238121 in words is "one hundred sixty-four million, two hundred thirty-eight thousand, one hundred twenty-one".