161987183 has 8 divisors (see below), whose sum is σ = 174483456. Its totient is φ = 149945400.

The previous prime is 161987171. The next prime is 161987197. The reversal of 161987183 is 381789161.

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 161987183 - 2⁴ = 161987167 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 (161987123) 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, 112883 + ... + 114308.

It is an arithmetic number, because the mean of its divisors is an integer number (21810432).

Almost surely, 2^161987183 is an apocalyptic number.

161987183 is a deficient number, since it is larger than the sum of its proper divisors (12496273).

161987183 is a wasteful number, since it uses less digits than its factorization.

161987183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227245.

The product of its digits is 72576, while the sum is 44.

The square root of 161987183 is about 12727.4185520867. The cubic root of 161987183 is about 545.1218009059.

The spelling of 161987183 in words is "one hundred sixty-one million, nine hundred eighty-seven thousand, one hundred eighty-three".