6359981 has 2 divisors, whose sum is σ = 6359982. Its totient is φ = 6359980.

The previous prime is 6359963. The next prime is 6359987. The reversal of 6359981 is 1899536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6100900 + 259081 = 2470^2 + 509^2 .

It is a cyclic number.

It is not a de Polignac number, because 6359981 - 2⁶ = 6359917 is a prime.

It is a super-2 number, since 2×6359981² = 80898716640722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6359987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3179990 + 3179991.

It is an arithmetic number, because the mean of its divisors is an integer number (3179991).

Almost surely, 2^6359981 is an apocalyptic number.

It is an amenable number.

6359981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6359981 is an equidigital number, since it uses as much as digits as its factorization.

6359981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 6359981 is about 2521.9002755859. The cubic root of 6359981 is about 185.2757611346.

The spelling of 6359981 in words is "six million, three hundred fifty-nine thousand, nine hundred eighty-one".