162671921 has 2 divisors, whose sum is σ = 162671922. Its totient is φ = 162671920.

The previous prime is 162671897. The next prime is 162671947. The reversal of 162671921 is 129176261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130873600 + 31798321 = 11440^2 + 5639^2 .

It is a cyclic number.

It is not a de Polignac number, because 162671921 - 2²² = 158477617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (162671221) 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, 81335960 + 81335961.

It is an arithmetic number, because the mean of its divisors is an integer number (81335961).

Almost surely, 2^162671921 is an apocalyptic number.

It is an amenable number.

162671921 is a deficient number, since it is larger than the sum of its proper divisors (1).

162671921 is an equidigital number, since it uses as much as digits as its factorization.

162671921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 162671921 is about 12754.2902977782. The cubic root of 162671921 is about 545.8888181708. Note that the first 4 decimals are identical.

The spelling of 162671921 in words is "one hundred sixty-two million, six hundred seventy-one thousand, nine hundred twenty-one".