164207881 has 2 divisors, whose sum is σ = 164207882. Its totient is φ = 164207880.

The previous prime is 164207873. The next prime is 164207909. The reversal of 164207881 is 188702461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141967225 + 22240656 = 11915^2 + 4716^2 .

It is a cyclic number.

It is not a de Polignac number, because 164207881 - 2³ = 164207873 is a prime.

It is a super-2 number, since 2×164207881² = 53928456365020322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 164207881.

It is not a weakly prime, because it can be changed into another prime (164207081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82103940 + 82103941.

It is an arithmetic number, because the mean of its divisors is an integer number (82103941).

Almost surely, 2^164207881 is an apocalyptic number.

It is an amenable number.

164207881 is a deficient number, since it is larger than the sum of its proper divisors (1).

164207881 is an equidigital number, since it uses as much as digits as its factorization.

164207881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 164207881 is about 12814.3622939263. The cubic root of 164207881 is about 547.6015460474.

The spelling of 164207881 in words is "one hundred sixty-four million, two hundred seven thousand, eight hundred eighty-one".