161987107 has 4 divisors (see below), whose sum is σ = 162572176. Its totient is φ = 161402040.

The previous prime is 161987099. The next prime is 161987123. The reversal of 161987107 is 701789161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 701789161 = 103 ⋅6813487.

It is a cyclic number.

It is not a de Polignac number, because 161987107 - 2³ = 161987099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161987107.

It is not an unprimeable number, because it can be changed into a prime (161987167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292119 + ... + 292672.

It is an arithmetic number, because the mean of its divisors is an integer number (40643044).

Almost surely, 2^161987107 is an apocalyptic number.

161987107 is a deficient number, since it is larger than the sum of its proper divisors (585069).

161987107 is an equidigital number, since it uses as much as digits as its factorization.

161987107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585068.

The product of its (nonzero) digits is 21168, while the sum is 40.

The square root of 161987107 is about 12727.4155664062. The cubic root of 161987107 is about 545.1217156537.

The spelling of 161987107 in words is "one hundred sixty-one million, nine hundred eighty-seven thousand, one hundred seven".