1980987163 has 4 divisors (see below), whose sum is σ = 1984021488. Its totient is φ = 1977952840.

The previous prime is 1980987157. The next prime is 1980987179. The reversal of 1980987163 is 3617890891.

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: 3617890891 = 409 ⋅8845699.

It is a cyclic number.

It is not a de Polignac number, because 1980987163 - 2¹⁷ = 1980856091 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 1980987163.

It is not an unprimeable number, because it can be changed into a prime (1980987103) 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, 1516183 + ... + 1517488.

It is an arithmetic number, because the mean of its divisors is an integer number (496005372).

Almost surely, 2^1980987163 is an apocalyptic number.

1980987163 is a deficient number, since it is larger than the sum of its proper divisors (3034325).

1980987163 is an equidigital number, since it uses as much as digits as its factorization.

1980987163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034324.

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

The square root of 1980987163 is about 44508.2819596533. The cubic root of 1980987163 is about 1255.9158857740.

The spelling of 1980987163 in words is "one billion, nine hundred eighty million, nine hundred eighty-seven thousand, one hundred sixty-three".