660130249 has 3 divisors (see below), whose sum is σ = 660155943. Its totient is φ = 660104556.

The previous prime is 660130201. The next prime is 660130259. The reversal of 660130249 is 942031066.

The square root of 660130249 is 25693.

It is a perfect power (a square), and thus also a powerful number.

660130249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 942031066 = 2 ⋅471015533.

It can be written as a sum of positive squares in only one way, i.e., 587335225 + 72795024 = 24235^2 + 8532^2 .

It is not a de Polignac number, because 660130249 - 2¹¹ = 660128201 is a prime.

It is a super-4 number, since 4×660130249⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 660130249.

It is not an unprimeable number, because it can be changed into a prime (660130259) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12847 + ... + 38539.

It is an arithmetic number, because the mean of its divisors is an integer number (220051981).

Almost surely, 2^660130249 is an apocalyptic number.

660130249 is the 25693-rd square number.

660130249 is the 12847-th centered octagonal number.

It is an amenable number.

660130249 is a deficient number, since it is larger than the sum of its proper divisors (25694).

660130249 is an frugal number, since it uses more digits than its factorization.

660130249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51386 (or 25693 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The cubic root of 660130249 is about 870.7160393067.

The spelling of 660130249 in words is "six hundred sixty million, one hundred thirty thousand, two hundred forty-nine".