621065 has 4 divisors (see below), whose sum is σ = 745284. Its totient is φ = 496848.

The previous prime is 621059. The next prime is 621083. The reversal of 621065 is 560126.

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

It can be written as a sum of positive squares in 2 ways, for example, as 215296 + 405769 = 464^2 + 637^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621065 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62102 + ... + 62111.

It is an arithmetic number, because the mean of its divisors is an integer number (186321).

2⁶²¹⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

621065 is a deficient number, since it is larger than the sum of its proper divisors (124219).

621065 is a wasteful number, since it uses less digits than its factorization.

621065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124218.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 621065 is about 788.0767729098. The cubic root of 621065 is about 85.3189859641.

The spelling of 621065 in words is "six hundred twenty-one thousand, sixty-five".