605981 has 4 divisors (see below), whose sum is σ = 632352. Its totient is φ = 579612.

The previous prime is 605977. The next prime is 605987. The reversal of 605981 is 189506.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 605981 - 2² = 605977 is a prime.

It is a super-2 number, since 2×605981² = 734425944722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 605981.

It is not an unprimeable number, because it can be changed into a prime (605987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13151 + ... + 13196.

It is an arithmetic number, because the mean of its divisors is an integer number (158088).

2⁶⁰⁵⁹⁸¹ is an apocalyptic number.

It is an amenable number.

605981 is a deficient number, since it is larger than the sum of its proper divisors (26371).

605981 is a wasteful number, since it uses less digits than its factorization.

605981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26370.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 605981 is about 778.4478145643. The cubic root of 605981 is about 84.6225943634.

It can be divided in two parts, 605 and 981, that multiplied together give a triangular number (593505 = T₁₀₈₉).

The spelling of 605981 in words is "six hundred five thousand, nine hundred eighty-one".