164767861 has 2 divisors, whose sum is σ = 164767862. Its totient is φ = 164767860.

The previous prime is 164767847. The next prime is 164767871. The reversal of 164767861 is 168767461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160807761 + 3960100 = 12681^2 + 1990^2 .

It is an emirp because it is prime and its reverse (168767461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164767861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164767871) 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, 82383930 + 82383931.

It is an arithmetic number, because the mean of its divisors is an integer number (82383931).

Almost surely, 2^164767861 is an apocalyptic number.

It is an amenable number.

164767861 is a deficient number, since it is larger than the sum of its proper divisors (1).

164767861 is an equidigital number, since it uses as much as digits as its factorization.

164767861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 164767861 is about 12836.1933999142. The cubic root of 164767861 is about 548.2233148225.

The spelling of 164767861 in words is "one hundred sixty-four million, seven hundred sixty-seven thousand, eight hundred sixty-one".