842981 has 2 divisors, whose sum is σ = 842982. Its totient is φ = 842980.

The previous prime is 842977. The next prime is 842987. The reversal of 842981 is 189248.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 749956 + 93025 = 866^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 842981 - 2² = 842977 is a prime.

It is a super-2 number, since 2×842981² = 1421233932722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 842981.

It is not a weakly prime, because it can be changed into another prime (842987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421490 + 421491.

It is an arithmetic number, because the mean of its divisors is an integer number (421491).

2⁸⁴²⁹⁸¹ is an apocalyptic number.

It is an amenable number.

842981 is a deficient number, since it is larger than the sum of its proper divisors (1).

842981 is an equidigital number, since it uses as much as digits as its factorization.

842981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 842981 is about 918.1399675431. The cubic root of 842981 is about 94.4653624818.

The spelling of 842981 in words is "eight hundred forty-two thousand, nine hundred eighty-one".