161159549 has 2 divisors, whose sum is σ = 161159550. Its totient is φ = 161159548.

The previous prime is 161159543. The next prime is 161159587. The reversal of 161159549 is 945951161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155800324 + 5359225 = 12482^2 + 2315^2 .

It is a cyclic number.

It is not a de Polignac number, because 161159549 - 2⁴ = 161159533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161159543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80579774 + 80579775.

It is an arithmetic number, because the mean of its divisors is an integer number (80579775).

Almost surely, 2^161159549 is an apocalyptic number.

It is an amenable number.

161159549 is a deficient number, since it is larger than the sum of its proper divisors (1).

161159549 is an equidigital number, since it uses as much as digits as its factorization.

161159549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 41.

The square root of 161159549 is about 12694.8630949688. The cubic root of 161159549 is about 544.1918263180.

The spelling of 161159549 in words is "one hundred sixty-one million, one hundred fifty-nine thousand, five hundred forty-nine".