163198987 has 4 divisors (see below), whose sum is σ = 186513136. Its totient is φ = 139884840.

The previous prime is 163198969. The next prime is 163198991. The reversal of 163198987 is 789891361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789891361 = 7 ⋅112841623.

It is a cyclic number.

It is not a de Polignac number, because 163198987 - 2⁷ = 163198859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163198957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11657064 + ... + 11657077.

It is an arithmetic number, because the mean of its divisors is an integer number (46628284).

Almost surely, 2^163198987 is an apocalyptic number.

163198987 is a deficient number, since it is larger than the sum of its proper divisors (23314149).

163198987 is an equidigital number, since it uses as much as digits as its factorization.

163198987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23314148.

The product of its digits is 653184, while the sum is 52.

The square root of 163198987 is about 12774.9358902501. The cubic root of 163198987 is about 546.4777525321.

The spelling of 163198987 in words is "one hundred sixty-three million, one hundred ninety-eight thousand, nine hundred eighty-seven".