620581 has 4 divisors (see below), whose sum is σ = 668332. Its totient is φ = 572832.

The previous prime is 620579. The next prime is 620603. The reversal of 620581 is 185026.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58081 + 562500 = 241^2 + 750^2 .

It is not a de Polignac number, because 620581 - 2¹ = 620579 is a prime.

It is a super-2 number, since 2×620581² = 770241555122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620531) 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, 23856 + ... + 23881.

It is an arithmetic number, because the mean of its divisors is an integer number (167083).

2⁶²⁰⁵⁸¹ is an apocalyptic number.

It is an amenable number.

620581 is a deficient number, since it is larger than the sum of its proper divisors (47751).

620581 is a wasteful number, since it uses less digits than its factorization.

620581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47750.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 620581 is about 787.7696363786. The cubic root of 620581 is about 85.2968169904.

The spelling of 620581 in words is "six hundred twenty thousand, five hundred eighty-one".