620551 has 8 divisors (see below), whose sum is σ = 663984. Its totient is φ = 577920.

The previous prime is 620549. The next prime is 620561. The reversal of 620551 is 155026.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 620551 - 2¹ = 620549 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 2836 + ... + 3046.

It is an arithmetic number, because the mean of its divisors is an integer number (82998).

2⁶²⁰⁵⁵¹ is an apocalyptic number.

620551 is a deficient number, since it is larger than the sum of its proper divisors (43433).

620551 is a wasteful number, since it uses less digits than its factorization.

620551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 620551 is about 787.7505950490. The cubic root of 620551 is about 85.2954425012.

Adding to 620551 its reverse (155026), we get a palindrome (775577).

The spelling of 620551 in words is "six hundred twenty thousand, five hundred fifty-one".