630121 has 4 divisors (see below), whose sum is σ = 634500. Its totient is φ = 625744.

The previous prime is 630107. The next prime is 630127. The reversal of 630121 is 121036.

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 404496 + 225625 = 636^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 630121 - 2⁹ = 629609 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630127) 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, 1966 + ... + 2263.

It is an arithmetic number, because the mean of its divisors is an integer number (158625).

2⁶³⁰¹²¹ is an apocalyptic number.

It is an amenable number.

630121 is a deficient number, since it is larger than the sum of its proper divisors (4379).

630121 is a wasteful number, since it uses less digits than its factorization.

630121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4378.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 630121 is about 793.8016124952. The cubic root of 630121 is about 85.7316767622.

Adding to 630121 its reverse (121036), we get a palindrome (751157).

The spelling of 630121 in words is "six hundred thirty thousand, one hundred twenty-one".