163912081 has 2 divisors, whose sum is σ = 163912082. Its totient is φ = 163912080.

The previous prime is 163912051. The next prime is 163912103. The reversal of 163912081 is 180219361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162180225 + 1731856 = 12735^2 + 1316^2 .

It is a cyclic number.

It is not a de Polignac number, because 163912081 - 2⁷ = 163911953 is a prime.

It is a super-2 number, since 2×163912081² = 53734340595501122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (163912051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81956040 + 81956041.

It is an arithmetic number, because the mean of its divisors is an integer number (81956041).

Almost surely, 2^163912081 is an apocalyptic number.

It is an amenable number.

163912081 is a deficient number, since it is larger than the sum of its proper divisors (1).

163912081 is an equidigital number, since it uses as much as digits as its factorization.

163912081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 163912081 is about 12802.8153544445. The cubic root of 163912081 is about 547.2725364685.

The spelling of 163912081 in words is "one hundred sixty-three million, nine hundred twelve thousand, eighty-one".