161107549 has 2 divisors, whose sum is σ = 161107550. Its totient is φ = 161107548.

The previous prime is 161107547. The next prime is 161107601. The reversal of 161107549 is 945701161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144240100 + 16867449 = 12010^2 + 4107^2 .

It is an emirp because it is prime and its reverse (945701161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161107549 - 2¹ = 161107547 is a prime.

It is a super-3 number, since 3×161107549³ (a number of 26 digits) contains 333 as substring.

Together with 161107547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161107543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80553774 + 80553775.

It is an arithmetic number, because the mean of its divisors is an integer number (80553775).

Almost surely, 2^161107549 is an apocalyptic number.

It is an amenable number.

161107549 is a deficient number, since it is larger than the sum of its proper divisors (1).

161107549 is an equidigital number, since it uses as much as digits as its factorization.

161107549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 161107549 is about 12692.8148572332. The cubic root of 161107549 is about 544.1332900842.

The spelling of 161107549 in words is "one hundred sixty-one million, one hundred seven thousand, five hundred forty-nine".