628591 has 2 divisors, whose sum is σ = 628592. Its totient is φ = 628590.

The previous prime is 628583. The next prime is 628651. The reversal of 628591 is 195826.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 628591 - 2³ = 628583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628561) 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 as a sum of consecutive naturals, namely, 314295 + 314296.

It is an arithmetic number, because the mean of its divisors is an integer number (314296).

2⁶²⁸⁵⁹¹ is an apocalyptic number.

628591 is a deficient number, since it is larger than the sum of its proper divisors (1).

628591 is an equidigital number, since it uses as much as digits as its factorization.

628591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 628591 is about 792.8373099193. The cubic root of 628591 is about 85.6622320189.

The spelling of 628591 in words is "six hundred twenty-eight thousand, five hundred ninety-one".