161688269 has 2 divisors, whose sum is σ = 161688270. Its totient is φ = 161688268.

The previous prime is 161688257. The next prime is 161688283. The reversal of 161688269 is 962886161.

161688269 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146773225 + 14915044 = 12115^2 + 3862^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161688269 is a prime.

It is a super-2 number, since 2×161688269² = 52286192664432722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161688869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80844134 + 80844135.

It is an arithmetic number, because the mean of its divisors is an integer number (80844135).

Almost surely, 2^161688269 is an apocalyptic number.

It is an amenable number.

161688269 is a deficient number, since it is larger than the sum of its proper divisors (1).

161688269 is an equidigital number, since it uses as much as digits as its factorization.

161688269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 47.

The square root of 161688269 is about 12715.6702143458. The cubic root of 161688269 is about 544.7862910943.

The spelling of 161688269 in words is "one hundred sixty-one million, six hundred eighty-eight thousand, two hundred sixty-nine".