5905981 has 2 divisors, whose sum is σ = 5905982. Its totient is φ = 5905980.

The previous prime is 5905967. The next prime is 5906003. The reversal of 5905981 is 1895095.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5597956 + 308025 = 2366^2 + 555^2 .

It is a cyclic number.

It is not a de Polignac number, because 5905981 - 2²¹ = 3808829 is a prime.

It is a super-2 number, since 2×5905981² = 69761223144722, which contains 22 as substring.

It is an Ulam number.

5905981 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 5905981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5905931) 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, 2952990 + 2952991.

It is an arithmetic number, because the mean of its divisors is an integer number (2952991).

Almost surely, 2^5905981 is an apocalyptic number.

It is an amenable number.

5905981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5905981 is an equidigital number, since it uses as much as digits as its factorization.

5905981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 5905981 is about 2430.2224178046. Note that the first 3 decimals coincide. The cubic root of 5905981 is about 180.7579255248.

It can be divided in two parts, 5905 and 981, that added together give a palindrome (6886).

The spelling of 5905981 in words is "five million, nine hundred five thousand, nine hundred eighty-one".