620181 has 6 divisors (see below), whose sum is σ = 895830. Its totient is φ = 413448.

The previous prime is 620171. The next prime is 620183. The reversal of 620181 is 181026.

It can be written as a sum of positive squares in only one way, i.e., 576081 + 44100 = 759^2 + 210^2 .

It is not a de Polignac number, because 620181 - 2⁶ = 620117 is a prime.

It is a super-2 number, since 2×620181² = 769248945522, which contains 22 as substring.

It is an Ulam number.

It is a Curzon 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 620181.

It is not an unprimeable number, because it can be changed into a prime (620183) 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 in 5 ways as a sum of consecutive naturals, for example, 34446 + ... + 34463.

It is an arithmetic number, because the mean of its divisors is an integer number (149305).

2⁶²⁰¹⁸¹ is an apocalyptic number.

It is an amenable number.

620181 is a deficient number, since it is larger than the sum of its proper divisors (275649).

620181 is a wasteful number, since it uses less digits than its factorization.

620181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68915 (or 68912 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 620181 is about 787.5157141289. The cubic root of 620181 is about 85.2784868235.

The spelling of 620181 in words is "six hundred twenty thousand, one hundred eighty-one".