1988979171 has 4 divisors (see below), whose sum is σ = 2651972232. Its totient is φ = 1325986112.

The previous prime is 1988979137. The next prime is 1988979193. The reversal of 1988979171 is 1719798891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1988979171 - 2⁷ = 1988979043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1988979101) 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, 331496526 + ... + 331496531.

It is an arithmetic number, because the mean of its divisors is an integer number (662993058).

Almost surely, 2^1988979171 is an apocalyptic number.

1988979171 is a deficient number, since it is larger than the sum of its proper divisors (662993061).

1988979171 is an equidigital number, since it uses as much as digits as its factorization.

1988979171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662993060.

The product of its digits is 2286144, while the sum is 60.

The square root of 1988979171 is about 44597.9727229837. The cubic root of 1988979171 is about 1257.6025569725.

The spelling of 1988979171 in words is "one billion, nine hundred eighty-eight million, nine hundred seventy-nine thousand, one hundred seventy-one".