981397 has 2 divisors, whose sum is σ = 981398. Its totient is φ = 981396.

The previous prime is 981391. The next prime is 981419. The reversal of 981397 is 793189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 938961 + 42436 = 969^2 + 206^2 .

It is an emirp because it is prime and its reverse (793189) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490698 + 490699.

It is an arithmetic number, because the mean of its divisors is an integer number (490699).

2⁹⁸¹³⁹⁷ is an apocalyptic number.

It is an amenable number.

981397 is a deficient number, since it is larger than the sum of its proper divisors (1).

981397 is an equidigital number, since it uses as much as digits as its factorization.

981397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 981397 is about 990.6548339356. The cubic root of 981397 is about 99.3760145197.

It can be divided in two parts, 981 and 397, that added together give a triangular number (1378 = T₅₂).

The spelling of 981397 in words is "nine hundred eighty-one thousand, three hundred ninety-seven".