630081 has 6 divisors (see below), whose sum is σ = 910130. Its totient is φ = 420048.

The previous prime is 630067. The next prime is 630101. The reversal of 630081 is 180036.

It can be written as a sum of positive squares in only one way, i.e., 435600 + 194481 = 660^2 + 441^2 .

It is not a de Polignac number, because 630081 - 2⁶ = 630017 is a prime.

It is a super-2 number, since 2×630081² = 794004133122, which contains 22 as substring.

It is a Duffinian number.

630081 is a modest number, since divided by 81 gives 63 as remainder.

It is a Curzon number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (630181) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34996 + ... + 35013.

2⁶³⁰⁰⁸¹ is an apocalyptic number.

It is an amenable number.

630081 is a deficient number, since it is larger than the sum of its proper divisors (280049).

630081 is a wasteful number, since it uses less digits than its factorization.

630081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70015 (or 70012 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 630081 is about 793.7764168832. The cubic root of 630081 is about 85.7298626452.

The spelling of 630081 in words is "six hundred thirty thousand, eighty-one".