661130 has 16 divisors (see below), whose sum is σ = 1260360. Its totient is φ = 248832.

The previous prime is 661121. The next prime is 661139. The reversal of 661130 is 31166.

It is an interprime number because it is at equal distance from previous prime (661121) and next prime (661139).

It can be written as a sum of positive squares in 4 ways, for example, as 635209 + 25921 = 797^2 + 161^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661099 and 661108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1775 + ... + 2114.

2⁶⁶¹¹³⁰ is an apocalyptic number.

661130 is a deficient number, since it is larger than the sum of its proper divisors (599230).

661130 is a wasteful number, since it uses less digits than its factorization.

661130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3913.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 661130 is about 813.0990099613. The cubic root of 661130 is about 87.1155376923.

Adding to 661130 its reverse (31166), we get a palindrome (692296).

The spelling of 661130 in words is "six hundred sixty-one thousand, one hundred thirty".