620521 has 8 divisors (see below), whose sum is σ = 712800. Its totient is φ = 534240.

The previous prime is 620519. The next prime is 620531. The reversal of 620521 is 125026.

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 620521 - 2¹ = 620519 is a prime.

It is a super-2 number, since 2×620521² = 770092622882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 620495 and 620504.

It is not an unprimeable number, because it can be changed into a prime (620531) 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 in 7 ways as a sum of consecutive naturals, for example, 1276 + ... + 1693.

It is an arithmetic number, because the mean of its divisors is an integer number (89100).

2⁶²⁰⁵²¹ is an apocalyptic number.

It is an amenable number.

620521 is a deficient number, since it is larger than the sum of its proper divisors (92279).

620521 is a wasteful number, since it uses less digits than its factorization.

620521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 620521 is about 787.7315532591. The cubic root of 620521 is about 85.2940679676.

Adding to 620521 its reverse (125026), we get a palindrome (745547).

It can be divided in two parts, 6205 and 21, that multiplied together give a triangular number (130305 = T₅₁₀).

The spelling of 620521 in words is "six hundred twenty thousand, five hundred twenty-one".