161641908 has 18 divisors (see below), whose sum is σ = 408594914. Its totient is φ = 53880624.

The previous prime is 161641901. The next prime is 161641913. The reversal of 161641908 is 809146161.

It is a happy number.

161641908 is a `hidden beast` number, since 1 + 6 + 1 + 641 + 9 + 0 + 8 = 666.

161641908 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 111260304 + 50381604 = 10548^2 + 7098^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×161641908² = 52256212843760928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4490053 = 161641908 / (1 + 6 + 1 + 6 + 4 + 1 + 9 + 0 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161641901) 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, 2244991 + ... + 2245062.

Almost surely, 2^161641908 is an apocalyptic number.

161641908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161641908 is an abundant number, since it is smaller than the sum of its proper divisors (246953006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161641908 is a wasteful number, since it uses less digits than its factorization.

161641908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4490063 (or 4490058 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 161641908 is about 12713.8470967682. The cubic root of 161641908 is about 544.7342171214.

The spelling of 161641908 in words is "one hundred sixty-one million, six hundred forty-one thousand, nine hundred eight".