601981 has 2 divisors, whose sum is σ = 601982. Its totient is φ = 601980.

The previous prime is 601969. The next prime is 602029. The reversal of 601981 is 189106.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549081 + 52900 = 741^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 601981 - 2⁵ = 601949 is a prime.

It is a super-2 number, since 2×601981² = 724762248722, which contains 22 as substring.

It is a plaindrome in base 9.

It is a zygodrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (601961) 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, 300990 + 300991.

It is an arithmetic number, because the mean of its divisors is an integer number (300991).

2⁶⁰¹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

601981 is a deficient number, since it is larger than the sum of its proper divisors (1).

601981 is an equidigital number, since it uses as much as digits as its factorization.

601981 is an odious number, because the sum of its binary digits is odd.

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

The square root of 601981 is about 775.8743454967. The cubic root of 601981 is about 84.4359890092.

The spelling of 601981 in words is "six hundred one thousand, nine hundred eighty-one".