164386421 has 2 divisors, whose sum is σ = 164386422. Its totient is φ = 164386420.

The previous prime is 164386403. The next prime is 164386427. The reversal of 164386421 is 124683461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160022500 + 4363921 = 12650^2 + 2089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164386421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164386427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82193210 + 82193211.

It is an arithmetic number, because the mean of its divisors is an integer number (82193211).

Almost surely, 2^164386421 is an apocalyptic number.

It is an amenable number.

164386421 is a deficient number, since it is larger than the sum of its proper divisors (1).

164386421 is an equidigital number, since it uses as much as digits as its factorization.

164386421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 35.

The square root of 164386421 is about 12821.3268034163. The cubic root of 164386421 is about 547.7999396260.

The spelling of 164386421 in words is "one hundred sixty-four million, three hundred eighty-six thousand, four hundred twenty-one".