1988298191 has 4 divisors (see below), whose sum is σ = 2169052584. Its totient is φ = 1807543800.

The previous prime is 1988298163. The next prime is 1988298229. The reversal of 1988298191 is 1918928891.

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 1988298191 - 2¹⁸ = 1988036047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988298131) 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, 90377180 + ... + 90377201.

It is an arithmetic number, because the mean of its divisors is an integer number (542263146).

Almost surely, 2^1988298191 is an apocalyptic number.

1988298191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1988298191 is a deficient number, since it is larger than the sum of its proper divisors (180754393).

1988298191 is a wasteful number, since it uses less digits than its factorization.

1988298191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180754392.

The product of its digits is 746496, while the sum is 56.

The square root of 1988298191 is about 44590.3374174271. The cubic root of 1988298191 is about 1257.4590160115.

The spelling of 1988298191 in words is "one billion, nine hundred eighty-eight million, two hundred ninety-eight thousand, one hundred ninety-one".