12805131 has 8 divisors (see below), whose sum is σ = 18077904. Its totient is φ = 8034560.

The previous prime is 12805129. The next prime is 12805141. The reversal of 12805131 is 13150821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12805131 - 2¹ = 12805129 is a prime.

It is a super-2 number, since 2×12805131² = 327942759854322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12805098 and 12805107.

It is not an unprimeable number, because it can be changed into a prime (12805141) 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, 125490 + ... + 125591.

It is an arithmetic number, because the mean of its divisors is an integer number (2259738).

Almost surely, 2^12805131 is an apocalyptic number.

12805131 is a deficient number, since it is larger than the sum of its proper divisors (5272773).

12805131 is a wasteful number, since it uses less digits than its factorization.

12805131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251101.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 12805131 is about 3578.4257712016. The cubic root of 12805131 is about 233.9526714127.

Adding to 12805131 its reverse (13150821), we get a palindrome (25955952).

The spelling of 12805131 in words is "twelve million, eight hundred five thousand, one hundred thirty-one".