161144549 has 2 divisors, whose sum is σ = 161144550. Its totient is φ = 161144548.

The previous prime is 161144537. The next prime is 161144573. The reversal of 161144549 is 945441161.

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., 130119649 + 31024900 = 11407^2 + 5570^2 .

It is a cyclic number.

It is not a de Polignac number, because 161144549 - 2¹² = 161140453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161144449) 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, 80572274 + 80572275.

It is an arithmetic number, because the mean of its divisors is an integer number (80572275).

Almost surely, 2^161144549 is an apocalyptic number.

It is an amenable number.

161144549 is a deficient number, since it is larger than the sum of its proper divisors (1).

161144549 is an equidigital number, since it uses as much as digits as its factorization.

161144549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 161144549 is about 12694.2722910768. The cubic root of 161144549 is about 544.1749421583.

The spelling of 161144549 in words is "one hundred sixty-one million, one hundred forty-four thousand, five hundred forty-nine".