163643849 has 2 divisors, whose sum is σ = 163643850. Its totient is φ = 163643848.

The previous prime is 163643813. The next prime is 163643861. The reversal of 163643849 is 948346361.

163643849 is nontrivially palindromic in base 16.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142086400 + 21557449 = 11920^2 + 4643^2 .

It is a cyclic number.

It is not a de Polignac number, because 163643849 - 2⁸ = 163643593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (163643899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81821924 + 81821925.

It is an arithmetic number, because the mean of its divisors is an integer number (81821925).

Almost surely, 2^163643849 is an apocalyptic number.

It is an amenable number.

163643849 is a deficient number, since it is larger than the sum of its proper divisors (1).

163643849 is an equidigital number, since it uses as much as digits as its factorization.

163643849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 44.

The square root of 163643849 is about 12792.3355568872. The cubic root of 163643849 is about 546.9738475755.

The spelling of 163643849 in words is "one hundred sixty-three million, six hundred forty-three thousand, eight hundred forty-nine".