981998769 has 4 divisors (see below), whose sum is σ = 1309331696. Its totient is φ = 654665844.

The previous prime is 981998737. The next prime is 981998819. The reversal of 981998769 is 967899189.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 981998769 - 2⁵ = 981998737 is a prime.

It is a super-2 number, since 2×981998769² = 1928643164635030722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981998729) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 163666459 + ... + 163666464.

It is an arithmetic number, because the mean of its divisors is an integer number (327332924).

Almost surely, 2^981998769 is an apocalyptic number.

It is an amenable number.

981998769 is a deficient number, since it is larger than the sum of its proper divisors (327332927).

981998769 is a wasteful number, since it uses less digits than its factorization.

981998769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327332926.

The product of its digits is 17635968, while the sum is 66.

The square root of 981998769 is about 31336.8595905844. The cubic root of 981998769 is about 993.9632202896.

The spelling of 981998769 in words is "nine hundred eighty-one million, nine hundred ninety-eight thousand, seven hundred sixty-nine".