2149971998 has 4 divisors (see below), whose sum is σ = 3224958000. Its totient is φ = 1074985998.

The previous prime is 2149971979. The next prime is 2149972039. The reversal of 2149971998 is 8991799412.

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

It is a super-2 number, since 2×2149971998² = 9244759184368224008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 537492998 + ... + 537493001.

It is an arithmetic number, because the mean of its divisors is an integer number (806239500).

Almost surely, 2^2149971998 is an apocalyptic number.

2149971998 is a deficient number, since it is larger than the sum of its proper divisors (1074986002).

2149971998 is a wasteful number, since it uses less digits than its factorization.

2149971998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074986001.

The product of its digits is 2939328, while the sum is 59.

The square root of 2149971998 is about 46367.7905231638. The cubic root of 2149971998 is about 1290.6572773719.

The spelling of 2149971998 in words is "two billion, one hundred forty-nine million, nine hundred seventy-one thousand, nine hundred ninety-eight".