981601 has 2 divisors, whose sum is σ = 981602. Its totient is φ = 981600.

The previous prime is 981599. The next prime is 981623. The reversal of 981601 is 106189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 950625 + 30976 = 975^2 + 176^2 .

It is an emirp because it is prime and its reverse (106189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981601 - 2¹ = 981599 is a prime.

Together with 981599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (981691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490800 + 490801.

It is an arithmetic number, because the mean of its divisors is an integer number (490801).

2⁹⁸¹⁶⁰¹ is an apocalyptic number.

It is an amenable number.

981601 is a deficient number, since it is larger than the sum of its proper divisors (1).

981601 is an equidigital number, since it uses as much as digits as its factorization.

981601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 981601 is about 990.7577907844. The cubic root of 981601 is about 99.3828997056.

The spelling of 981601 in words is "nine hundred eighty-one thousand, six hundred one".