1980281 has 2 divisors, whose sum is σ = 1980282. Its totient is φ = 1980280.

The previous prime is 1980269. The next prime is 1980283. The reversal of 1980281 is 1820891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1666681 + 313600 = 1291^2 + 560^2 .

It is an emirp because it is prime and its reverse (1820891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1980281 - 2¹⁸ = 1718137 is a prime.

It is a super-2 number, since 2×1980281² = 7843025677922, which contains 22 as substring.

Together with 1980283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1980283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990140 + 990141.

It is an arithmetic number, because the mean of its divisors is an integer number (990141).

2^1980281 is an apocalyptic number.

It is an amenable number.

1980281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980281 is an equidigital number, since it uses as much as digits as its factorization.

1980281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1980281 is about 1407.2245734068. The cubic root of 1980281 is about 125.5766635819.

The spelling of 1980281 in words is "one million, nine hundred eighty thousand, two hundred eighty-one".