161789149 has 2 divisors, whose sum is σ = 161789150. Its totient is φ = 161789148.

The previous prime is 161789129. The next prime is 161789171. The reversal of 161789149 is 941987161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86620249 + 75168900 = 9307^2 + 8670^2 .

It is a cyclic number.

It is not a de Polignac number, because 161789149 - 2⁹ = 161788637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161789099 and 161789108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161789129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80894574 + 80894575.

It is an arithmetic number, because the mean of its divisors is an integer number (80894575).

Almost surely, 2^161789149 is an apocalyptic number.

It is an amenable number.

161789149 is a deficient number, since it is larger than the sum of its proper divisors (1).

161789149 is an equidigital number, since it uses as much as digits as its factorization.

161789149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 46.

The square root of 161789149 is about 12719.6363548649. The cubic root of 161789149 is about 544.8995679482.

The spelling of 161789149 in words is "one hundred sixty-one million, seven hundred eighty-nine thousand, one hundred forty-nine".