620620531 has 4 divisors (see below), whose sum is σ = 629883592. Its totient is φ = 611357472.

The previous prime is 620620519. The next prime is 620620537. The reversal of 620620531 is 135026026.

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

It is a cyclic number.

It is not a de Polignac number, because 620620531 - 2¹¹ = 620618483 is a prime.

It is a super-2 number, since 2×620620531² = 770339686997443922, 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 = 620620496 and 620620505.

It is not an unprimeable number, because it can be changed into a prime (620620537) 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, 4631430 + ... + 4631563.

It is an arithmetic number, because the mean of its divisors is an integer number (157470898).

Almost surely, 2^620620531 is an apocalyptic number.

620620531 is a deficient number, since it is larger than the sum of its proper divisors (9263061).

620620531 is an equidigital number, since it uses as much as digits as its factorization.

620620531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9263060.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 620620531 is about 24912.2566420628. The cubic root of 620620531 is about 852.9862808726.

Adding to 620620531 its reverse (135026026), we get a palindrome (755646557).

The spelling of 620620531 in words is "six hundred twenty million, six hundred twenty thousand, five hundred thirty-one".