624121 has 4 divisors (see below), whose sum is σ = 660852. Its totient is φ = 587392.

The previous prime is 624119. The next prime is 624133. The reversal of 624121 is 121426.

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 511225 + 112896 = 715^2 + 336^2 .

It is a cyclic number.

It is not a de Polignac number, because 624121 - 2¹ = 624119 is a prime.

It is a Duffinian number.

624121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 624095 and 624104.

It is not an unprimeable number, because it can be changed into a prime (624191) 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, 18340 + ... + 18373.

It is an arithmetic number, because the mean of its divisors is an integer number (165213).

2⁶²⁴¹²¹ is an apocalyptic number.

It is an amenable number.

624121 is a deficient number, since it is larger than the sum of its proper divisors (36731).

624121 is a wasteful number, since it uses less digits than its factorization.

624121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36730.

The product of its digits is 96, while the sum is 16.

The square root of 624121 is about 790.0132910274. The cubic root of 624121 is about 85.4586966926.

Adding to 624121 its reverse (121426), we get a palindrome (745547).

The spelling of 624121 in words is "six hundred twenty-four thousand, one hundred twenty-one".