988220892649 has 3 divisors (see below), whose sum is σ = 988221886743. Its totient is φ = 988219898556.

The previous prime is 988220892647. The next prime is 988220892679. The reversal of 988220892649 is 946298022889.

The square root of 988220892649 is 994093.

It is a perfect power (a square), and thus also a powerful number.

988220892649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 27954168025 + 960266724624 = 167195^2 + 979932^2 .

It is not a de Polignac number, because 988220892649 - 2¹ = 988220892647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988220892643) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 497047 + ... + 1491139.

It is an arithmetic number, because the mean of its divisors is an integer number (329407295581).

Almost surely, 2^988220892649 is an apocalyptic number.

988220892649 is the 994093-rd square number.

988220892649 is the 497047-th centered octagonal number.

It is an amenable number.

988220892649 is a deficient number, since it is larger than the sum of its proper divisors (994094).

988220892649 is an frugal number, since it uses more digits than its factorization.

988220892649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988186 (or 994093 counting only the distinct ones).

The product of its (nonzero) digits is 71663616, while the sum is 67.

The spelling of 988220892649 in words is "nine hundred eighty-eight billion, two hundred twenty million, eight hundred ninety-two thousand, six hundred forty-nine".