9980209801 has 3 divisors (see below), whose sum is σ = 9980309703. Its totient is φ = 9980109900.

The previous prime is 9980209777. The next prime is 9980209847. The reversal of 9980209801 is 1089020899.

It is a happy number.

The square root of 9980209801 is 99901.

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

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., 9711905401 + 268304400 = 98549^2 + 16380^2 .

It is not a de Polignac number, because 9980209801 - 2¹⁷ = 9980078729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9980209201) 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, 49951 + ... + 149851.

It is an arithmetic number, because the mean of its divisors is an integer number (3326769901).

Almost surely, 2^9980209801 is an apocalyptic number.

9980209801 is the 99901-st square number.

9980209801 is the 49951-st centered octagonal number.

It is an amenable number.

9980209801 is a deficient number, since it is larger than the sum of its proper divisors (99902).

9980209801 is an frugal number, since it uses more digits than its factorization.

9980209801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199802 (or 99901 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The cubic root of 9980209801 is about 2153.0125284152.

The spelling of 9980209801 in words is "nine billion, nine hundred eighty million, two hundred nine thousand, eight hundred one".