163185749 has 2 divisors, whose sum is σ = 163185750. Its totient is φ = 163185748.

The previous prime is 163185709. The next prime is 163185751. The reversal of 163185749 is 947581361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155176849 + 8008900 = 12457^2 + 2830^2 .

It is an emirp because it is prime and its reverse (947581361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163185749 is a prime.

Together with 163185751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163185709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81592874 + 81592875.

It is an arithmetic number, because the mean of its divisors is an integer number (81592875).

Almost surely, 2^163185749 is an apocalyptic number.

It is an amenable number.

163185749 is a deficient number, since it is larger than the sum of its proper divisors (1).

163185749 is an equidigital number, since it uses as much as digits as its factorization.

163185749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 163185749 is about 12774.4177558118. The cubic root of 163185749 is about 546.4629761575.

The spelling of 163185749 in words is "one hundred sixty-three million, one hundred eighty-five thousand, seven hundred forty-nine".