981990163 has 16 divisors (see below), whose sum is σ = 1225278720. Its totient is φ = 764575200.

The previous prime is 981990157. The next prime is 981990173. The reversal of 981990163 is 361099189.

It is a cyclic number.

It is not a de Polignac number, because 981990163 - 2¹³ = 981981971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981990143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107973 + ... + 116713.

It is an arithmetic number, because the mean of its divisors is an integer number (76579920).

Almost surely, 2^981990163 is an apocalyptic number.

981990163 is a deficient number, since it is larger than the sum of its proper divisors (243288557).

981990163 is a wasteful number, since it uses less digits than its factorization.

981990163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10218.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 981990163 is about 31336.7222759497. The cubic root of 981990163 is about 993.9603166633.

The spelling of 981990163 in words is "nine hundred eighty-one million, nine hundred ninety thousand, one hundred sixty-three".