164454421 has 2 divisors, whose sum is σ = 164454422. Its totient is φ = 164454420.

The previous prime is 164454397. The next prime is 164454461. The reversal of 164454421 is 124454461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139594225 + 24860196 = 11815^2 + 4986^2 .

It is an emirp because it is prime and its reverse (124454461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164454421 - 2⁷ = 164454293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164454461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82227210 + 82227211.

It is an arithmetic number, because the mean of its divisors is an integer number (82227211).

Almost surely, 2^164454421 is an apocalyptic number.

It is an amenable number.

164454421 is a deficient number, since it is larger than the sum of its proper divisors (1).

164454421 is an equidigital number, since it uses as much as digits as its factorization.

164454421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 31.

The square root of 164454421 is about 12823.9783608676. The cubic root of 164454421 is about 547.8754634243.

It can be divided in two parts, 1644 and 54421, that added together give a palindrome (56065).

The spelling of 164454421 in words is "one hundred sixty-four million, four hundred fifty-four thousand, four hundred twenty-one".