161181180 has 72 divisors (see below), whose sum is σ = 514659600. Its totient is φ = 40718592.

The previous prime is 161181173. The next prime is 161181187. The reversal of 161181180 is 81181161.

It is an interprime number because it is at equal distance from previous prime (161181173) and next prime (161181187).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161181187) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20145 + ... + 26984.

It is an arithmetic number, because the mean of its divisors is an integer number (7148050).

Almost surely, 2^161181180 is an apocalyptic number.

161181180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161181180 is an abundant number, since it is smaller than the sum of its proper divisors (353478420).

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

161181180 is a wasteful number, since it uses less digits than its factorization.

161181180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47163 (or 47158 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 27.

The square root of 161181180 is about 12695.7150251571. The cubic root of 161181180 is about 544.2161725571.

The spelling of 161181180 in words is "one hundred sixty-one million, one hundred eighty-one thousand, one hundred eighty".