980921 has 2 divisors, whose sum is σ = 980922. Its totient is φ = 980920.

The previous prime is 980911. The next prime is 980957. The reversal of 980921 is 129089.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 765625 + 215296 = 875^2 + 464^2 .

It is an emirp because it is prime and its reverse (129089) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-980921 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 980921.

It is not a weakly prime, because it can be changed into another prime (980911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490460 + 490461.

It is an arithmetic number, because the mean of its divisors is an integer number (490461).

2⁹⁸⁰⁹²¹ is an apocalyptic number.

It is an amenable number.

980921 is a deficient number, since it is larger than the sum of its proper divisors (1).

980921 is an equidigital number, since it uses as much as digits as its factorization.

980921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 980921 is about 990.4145596668. The cubic root of 980921 is about 99.3599453745.

The spelling of 980921 in words is "nine hundred eighty thousand, nine hundred twenty-one".