6620531 has 16 divisors (see below), whose sum is σ = 7488000. Its totient is φ = 5816448.

The previous prime is 6620519. The next prime is 6620587. The reversal of 6620531 is 1350266.

It is not a de Polignac number, because 6620531 - 2¹⁰ = 6619507 is a prime.

It is a super-2 number, since 2×6620531² = 87662861443922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6620497 and 6620506.

It is not an unprimeable number, because it can be changed into a prime (6620501) 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 15 ways as a sum of consecutive naturals, for example, 33170 + ... + 33368.

It is an arithmetic number, because the mean of its divisors is an integer number (468000).

Almost surely, 2^6620531 is an apocalyptic number.

6620531 is a deficient number, since it is larger than the sum of its proper divisors (867469).

6620531 is a wasteful number, since it uses less digits than its factorization.

6620531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 6620531 is about 2573.0392534899. The cubic root of 6620531 is about 187.7720471650.

Adding to 6620531 its reverse (1350266), we get a palindrome (7970797).

The spelling of 6620531 in words is "six million, six hundred twenty thousand, five hundred thirty-one".