164861261 has 2 divisors, whose sum is σ = 164861262. Its totient is φ = 164861260.

The previous prime is 164861209. The next prime is 164861267. The reversal of 164861261 is 162168461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100380361 + 64480900 = 10019^2 + 8030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164861261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164861267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82430630 + 82430631.

It is an arithmetic number, because the mean of its divisors is an integer number (82430631).

Almost surely, 2^164861261 is an apocalyptic number.

It is an amenable number.

164861261 is a deficient number, since it is larger than the sum of its proper divisors (1).

164861261 is an equidigital number, since it uses as much as digits as its factorization.

164861261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 35.

The square root of 164861261 is about 12839.8310347138. The cubic root of 164861261 is about 548.3268835347.

The spelling of 164861261 in words is "one hundred sixty-four million, eight hundred sixty-one thousand, two hundred sixty-one".