161193869 has 2 divisors, whose sum is σ = 161193870. Its totient is φ = 161193868.

The previous prime is 161193839. The next prime is 161193917. The reversal of 161193869 is 968391161.

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., 94575625 + 66618244 = 9725^2 + 8162^2 .

It is an emirp because it is prime and its reverse (968391161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161193869 is a prime.

It is a super-2 number, since 2×161193869² = 51966926806378322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161193839) 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, 80596934 + 80596935.

It is an arithmetic number, because the mean of its divisors is an integer number (80596935).

Almost surely, 2^161193869 is an apocalyptic number.

It is an amenable number.

161193869 is a deficient number, since it is larger than the sum of its proper divisors (1).

161193869 is an equidigital number, since it uses as much as digits as its factorization.

161193869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 161193869 is about 12696.2147508618. The cubic root of 161193869 is about 544.2304533348.

The spelling of 161193869 in words is "one hundred sixty-one million, one hundred ninety-three thousand, eight hundred sixty-nine".