12780581 has 4 divisors (see below), whose sum is σ = 13942464. Its totient is φ = 11618700.

The previous prime is 12780557. The next prime is 12780601. The reversal of 12780581 is 18508721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12780581 - 2⁶ = 12780517 is a prime.

It is a super-2 number, since 2×12780581² = 326686501395122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12780511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580925 + ... + 580946.

It is an arithmetic number, because the mean of its divisors is an integer number (3485616).

Almost surely, 2^12780581 is an apocalyptic number.

12780581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12780581 is a deficient number, since it is larger than the sum of its proper divisors (1161883).

12780581 is a wasteful number, since it uses less digits than its factorization.

12780581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161882.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 12780581 is about 3574.9938461485. The cubic root of 12780581 is about 233.8030643919.

It can be divided in two parts, 127 and 80581, that added together give a palindrome (80708).

The spelling of 12780581 in words is "twelve million, seven hundred eighty thousand, five hundred eighty-one".