161988867 has 12 divisors (see below), whose sum is σ = 242052720. Its totient is φ = 104268528.

The previous prime is 161988847. The next prime is 161988887. The reversal of 161988867 is 768889161.

It is an interprime number because it is at equal distance from previous prime (161988847) and next prime (161988887).

It is not a de Polignac number, because 161988867 - 2⁶ = 161988803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161988817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310063 + ... + 310584.

It is an arithmetic number, because the mean of its divisors is an integer number (20171060).

Almost surely, 2^161988867 is an apocalyptic number.

161988867 is a deficient number, since it is larger than the sum of its proper divisors (80063853).

161988867 is a wasteful number, since it uses less digits than its factorization.

161988867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620682 (or 620679 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 161988867 is about 12727.4847082996. The cubic root of 161988867 is about 545.1236899071.

The spelling of 161988867 in words is "one hundred sixty-one million, nine hundred eighty-eight thousand, eight hundred sixty-seven".