981287998 has 4 divisors (see below), whose sum is σ = 1471932000. Its totient is φ = 490643998.

The previous prime is 981287977. The next prime is 981288013. The reversal of 981287998 is 899782189.

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

It is a super-2 number, since 2×981287998² = 1925852270037696008, 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 (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245321998 + ... + 245322001.

It is an arithmetic number, because the mean of its divisors is an integer number (367983000).

Almost surely, 2^981287998 is an apocalyptic number.

981287998 is a deficient number, since it is larger than the sum of its proper divisors (490644002).

981287998 is a wasteful number, since it uses less digits than its factorization.

981287998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490644001.

The product of its digits is 5225472, while the sum is 61.

The square root of 981287998 is about 31325.5167235913. The cubic root of 981287998 is about 993.7233521169.

The spelling of 981287998 in words is "nine hundred eighty-one million, two hundred eighty-seven thousand, nine hundred ninety-eight".