164398649 has 2 divisors, whose sum is σ = 164398650. Its totient is φ = 164398648.

The previous prime is 164398601. The next prime is 164398693. The reversal of 164398649 is 946893461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160909225 + 3489424 = 12685^2 + 1868^2 .

It is an emirp because it is prime and its reverse (946893461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164398649 - 2¹² = 164394553 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 164398597 and 164398606.

It is not a weakly prime, because it can be changed into another prime (164398699) 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, 82199324 + 82199325.

It is an arithmetic number, because the mean of its divisors is an integer number (82199325).

Almost surely, 2^164398649 is an apocalyptic number.

It is an amenable number.

164398649 is a deficient number, since it is larger than the sum of its proper divisors (1).

164398649 is an equidigital number, since it uses as much as digits as its factorization.

164398649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 50.

The square root of 164398649 is about 12821.8036562724. The cubic root of 164398649 is about 547.8135221176.

The spelling of 164398649 in words is "one hundred sixty-four million, three hundred ninety-eight thousand, six hundred forty-nine".