12730581 has 8 divisors (see below), whose sum is σ = 18860160. Its totient is φ = 8487036.

The previous prime is 12730579. The next prime is 12730583. The reversal of 12730581 is 18503721.

12730581 is a `hidden beast` number, since 12 + 73 + 0 + 581 = 666.

It is an interprime number because it is at equal distance from previous prime (12730579) and next prime (12730583).

It is not a de Polignac number, because 12730581 - 2¹ = 12730579 is a prime.

It is a super-2 number, since 2×12730581² = 324135385195122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 471503 = 12730581 / (1 + 2 + 7 + 3 + 0 + 5 + 8 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12730583) 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, 235725 + ... + 235778.

It is an arithmetic number, because the mean of its divisors is an integer number (2357520).

Almost surely, 2^12730581 is an apocalyptic number.

It is an amenable number.

12730581 is a deficient number, since it is larger than the sum of its proper divisors (6129579).

12730581 is an equidigital number, since it uses as much as digits as its factorization.

12730581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471512 (or 471506 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 12730581 is about 3567.9939742102. The cubic root of 12730581 is about 233.4977722949.

The spelling of 12730581 in words is "twelve million, seven hundred thirty thousand, five hundred eighty-one".