161183987 has 8 divisors (see below), whose sum is σ = 173070432. Its totient is φ = 149564800.

The previous prime is 161183969. The next prime is 161183999. The reversal of 161183987 is 789381161.

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 161183987 - 2²⁰ = 160135411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161183947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65564 + ... + 67977.

It is an arithmetic number, because the mean of its divisors is an integer number (21633804).

Almost surely, 2^161183987 is an apocalyptic number.

161183987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

161183987 is a deficient number, since it is larger than the sum of its proper divisors (11886445).

161183987 is a wasteful number, since it uses less digits than its factorization.

161183987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133629.

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

The square root of 161183987 is about 12695.8255737861. The cubic root of 161183987 is about 544.2193317472.

The spelling of 161183987 in words is "one hundred sixty-one million, one hundred eighty-three thousand, nine hundred eighty-seven".