298371991 has 4 divisors (see below), whose sum is σ = 314075800. Its totient is φ = 282668184.

The previous prime is 298371973. The next prime is 298372007. The reversal of 298371991 is 199173892.

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 298371991 - 2⁷ = 298371863 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 (298374991) 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, 7851876 + ... + 7851913.

It is an arithmetic number, because the mean of its divisors is an integer number (78518950).

Almost surely, 2^298371991 is an apocalyptic number.

298371991 is a deficient number, since it is larger than the sum of its proper divisors (15703809).

298371991 is a wasteful number, since it uses less digits than its factorization.

298371991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15703808.

The product of its digits is 244944, while the sum is 49.

The square root of 298371991 is about 17273.4475713449. The cubic root of 298371991 is about 668.2198164730.

The spelling of 298371991 in words is "two hundred ninety-eight million, three hundred seventy-one thousand, nine hundred ninety-one".