163045681 has 2 divisors, whose sum is σ = 163045682. Its totient is φ = 163045680.

The previous prime is 163045667. The next prime is 163045697. The reversal of 163045681 is 186540361.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135839025 + 27206656 = 11655^2 + 5216^2 .

It is a cyclic number.

It is not a de Polignac number, because 163045681 - 2¹⁹ = 162521393 is a prime.

It is a super-2 number, since 2×163045681² = 53167788185507522, which contains 22 as substring.

It is equal to p_9135556 and since 163045681 and 9135556 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (163045661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81522840 + 81522841.

It is an arithmetic number, because the mean of its divisors is an integer number (81522841).

Almost surely, 2^163045681 is an apocalyptic number.

It is an amenable number.

163045681 is a deficient number, since it is larger than the sum of its proper divisors (1).

163045681 is an equidigital number, since it uses as much as digits as its factorization.

163045681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 163045681 is about 12768.9342155091. The cubic root of 163045681 is about 546.3065820144.

The spelling of 163045681 in words is "one hundred sixty-three million, forty-five thousand, six hundred eighty-one".