161081549 has 8 divisors (see below), whose sum is σ = 169817088. Its totient is φ = 152567280.

The previous prime is 161081533. The next prime is 161081551. The reversal of 161081549 is 945180161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161081549 - 2⁴ = 161081533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161081519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53822 + ... + 56735.

It is an arithmetic number, because the mean of its divisors is an integer number (21227136).

Almost surely, 2^161081549 is an apocalyptic number.

It is an amenable number.

161081549 is a deficient number, since it is larger than the sum of its proper divisors (8735539).

161081549 is a wasteful number, since it uses less digits than its factorization.

161081549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110635.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 161081549 is about 12691.7906144090. The cubic root of 161081549 is about 544.1040172439.

The spelling of 161081549 in words is "one hundred sixty-one million, eighty-one thousand, five hundred forty-nine".