163838749 has 2 divisors, whose sum is σ = 163838750. Its totient is φ = 163838748.

The previous prime is 163838699. The next prime is 163838837. The reversal of 163838749 is 947838361.

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., 146047225 + 17791524 = 12085^2 + 4218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163838749 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163838149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81919374 + 81919375.

It is an arithmetic number, because the mean of its divisors is an integer number (81919375).

Almost surely, 2^163838749 is an apocalyptic number.

It is an amenable number.

163838749 is a deficient number, since it is larger than the sum of its proper divisors (1).

163838749 is an equidigital number, since it uses as much as digits as its factorization.

163838749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 49.

The square root of 163838749 is about 12799.9511327192. The cubic root of 163838749 is about 547.1909102377.

The spelling of 163838749 in words is "one hundred sixty-three million, eight hundred thirty-eight thousand, seven hundred forty-nine".