161644149 has 6 divisors (see below), whose sum is σ = 233486006. Its totient is φ = 107762760.

The previous prime is 161644123. The next prime is 161644163. The reversal of 161644149 is 941446161.

161644149 is a `hidden beast` number, since 1 + 6 + 1 + 644 + 1 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 125283249 + 36360900 = 11193^2 + 6030^2 .

It is not a de Polignac number, because 161644149 - 2⁹ = 161643637 is a prime.

It is a super-2 number, since 2×161644149² = 52257661811868402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161644169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8980222 + ... + 8980239.

Almost surely, 2^161644149 is an apocalyptic number.

It is an amenable number.

161644149 is a deficient number, since it is larger than the sum of its proper divisors (71841857).

161644149 is a wasteful number, since it uses less digits than its factorization.

161644149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17960467 (or 17960464 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 161644149 is about 12713.9352287166. The cubic root of 161644149 is about 544.7367345044.

The spelling of 161644149 in words is "one hundred sixty-one million, six hundred forty-four thousand, one hundred forty-nine".