164512861 has 2 divisors, whose sum is σ = 164512862. Its totient is φ = 164512860.

The previous prime is 164512847. The next prime is 164512867. The reversal of 164512861 is 168215461.

164512861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82700836 + 81812025 = 9094^2 + 9045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164512861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164512867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82256430 + 82256431.

It is an arithmetic number, because the mean of its divisors is an integer number (82256431).

Almost surely, 2^164512861 is an apocalyptic number.

It is an amenable number.

164512861 is a deficient number, since it is larger than the sum of its proper divisors (1).

164512861 is an equidigital number, since it uses as much as digits as its factorization.

164512861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 34.

The square root of 164512861 is about 12826.2567025614. The cubic root of 164512861 is about 547.9403528327.

The spelling of 164512861 in words is "one hundred sixty-four million, five hundred twelve thousand, eight hundred sixty-one".