621245 has 4 divisors (see below), whose sum is σ = 745500. Its totient is φ = 496992.

The previous prime is 621241. The next prime is 621259. The reversal of 621245 is 542126.

It is a happy number.

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 344569 + 276676 = 587^2 + 526^2 .

It is a cyclic number.

It is not a de Polignac number, because 621245 - 2² = 621241 is a prime.

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 (621241) 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 in 3 ways as a sum of consecutive naturals, for example, 62120 + ... + 62129.

It is an arithmetic number, because the mean of its divisors is an integer number (186375).

2⁶²¹²⁴⁵ is an apocalyptic number.

It is an amenable number.

621245 is a deficient number, since it is larger than the sum of its proper divisors (124255).

621245 is a wasteful number, since it uses less digits than its factorization.

621245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124254.

The product of its digits is 480, while the sum is 20.

The square root of 621245 is about 788.1909667079. The cubic root of 621245 is about 85.3272276854.

The spelling of 621245 in words is "six hundred twenty-one thousand, two hundred forty-five".