620591 has 4 divisors (see below), whose sum is σ = 628152. Its totient is φ = 613032.

The previous prime is 620579. The next prime is 620603. The reversal of 620591 is 195026.

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

It is an interprime number because it is at equal distance from previous prime (620579) and next prime (620603).

It is a cyclic number.

It is not a de Polignac number, because 620591 - 2¹⁸ = 358447 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3656 + ... + 3821.

It is an arithmetic number, because the mean of its divisors is an integer number (157038).

2⁶²⁰⁵⁹¹ is an apocalyptic number.

620591 is a deficient number, since it is larger than the sum of its proper divisors (7561).

620591 is an equidigital number, since it uses as much as digits as its factorization.

620591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7560.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 620591 is about 787.7759833861. The cubic root of 620591 is about 85.2972751437.

The spelling of 620591 in words is "six hundred twenty thousand, five hundred ninety-one".