161748869 has 2 divisors, whose sum is σ = 161748870. Its totient is φ = 161748868.

The previous prime is 161748859. The next prime is 161748889. The reversal of 161748869 is 968847161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115304644 + 46444225 = 10738^2 + 6815^2 .

It is an emirp because it is prime and its reverse (968847161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161748869 is a prime.

It is a super-2 number, since 2×161748869² = 52325393245558322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161748859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80874434 + 80874435.

It is an arithmetic number, because the mean of its divisors is an integer number (80874435).

Almost surely, 2^161748869 is an apocalyptic number.

It is an amenable number.

161748869 is a deficient number, since it is larger than the sum of its proper divisors (1).

161748869 is an equidigital number, since it uses as much as digits as its factorization.

161748869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 161748869 is about 12718.0528777011. The cubic root of 161748869 is about 544.8543437032.

The spelling of 161748869 in words is "one hundred sixty-one million, seven hundred forty-eight thousand, eight hundred sixty-nine".