161610549 has 8 divisors (see below), whose sum is σ = 215558112. Its totient is φ = 107701680.

The previous prime is 161610511. The next prime is 161610557. The reversal of 161610549 is 945016161.

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

It is not a de Polignac number, because 161610549 - 2¹² = 161606453 is a prime.

It is a super-2 number, since 2×161610549² = 52235939096162802, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161610509) 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, 2134 + ... + 18104.

It is an arithmetic number, because the mean of its divisors is an integer number (26944764).

Almost surely, 2^161610549 is an apocalyptic number.

It is an amenable number.

161610549 is a deficient number, since it is larger than the sum of its proper divisors (53947563).

161610549 is a wasteful number, since it uses less digits than its factorization.

161610549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19347.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 161610549 is about 12712.6137753021. The cubic root of 161610549 is about 544.6989881693.

It can be divided in two parts, 1 and 61610549, that added together give a triangular number (61610550 = T₁₁₁₀₀).

The spelling of 161610549 in words is "one hundred sixty-one million, six hundred ten thousand, five hundred forty-nine".