164461421 has 2 divisors, whose sum is σ = 164461422. Its totient is φ = 164461420.

The previous prime is 164461391. The next prime is 164461447. The reversal of 164461421 is 124164461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158634025 + 5827396 = 12595^2 + 2414^2 .

It is an emirp because it is prime and its reverse (124164461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164461421 - 2⁶ = 164461357 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 (164461471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82230710 + 82230711.

It is an arithmetic number, because the mean of its divisors is an integer number (82230711).

Almost surely, 2^164461421 is an apocalyptic number.

It is an amenable number.

164461421 is a deficient number, since it is larger than the sum of its proper divisors (1).

164461421 is an equidigital number, since it uses as much as digits as its factorization.

164461421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 29.

The square root of 164461421 is about 12824.2512841881. The cubic root of 164461421 is about 547.8832367510.

The spelling of 164461421 in words is "one hundred sixty-four million, four hundred sixty-one thousand, four hundred twenty-one".