620531 has 2 divisors, whose sum is σ = 620532. Its totient is φ = 620530.

The previous prime is 620519. The next prime is 620549. The reversal of 620531 is 135026.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 620531 - 2⁶ = 620467 is a prime.

It is a super-2 number, since 2×620531² = 770117443922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (620561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310265 + 310266.

It is an arithmetic number, because the mean of its divisors is an integer number (310266).

2⁶²⁰⁵³¹ is an apocalyptic number.

620531 is a deficient number, since it is larger than the sum of its proper divisors (1).

620531 is an equidigital number, since it uses as much as digits as its factorization.

620531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 620531 is about 787.7379005735. The cubic root of 620531 is about 85.2945261504.

Adding to 620531 its reverse (135026), we get a palindrome (755557).

The spelling of 620531 in words is "six hundred twenty thousand, five hundred thirty-one".