12780081 has 6 divisors (see below), whose sum is σ = 18460130. Its totient is φ = 8520048.

The previous prime is 12780017. The next prime is 12780113. The reversal of 12780081 is 18008721.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 1083681 = 3420^2 + 1041^2 .

It is not a de Polignac number, because 12780081 - 2⁶ = 12780017 is a prime.

It is a super-2 number, since 2×12780081² = 326660940733122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12780181) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 709996 + ... + 710013.

Almost surely, 2^12780081 is an apocalyptic number.

It is an amenable number.

12780081 is a deficient number, since it is larger than the sum of its proper divisors (5680049).

12780081 is a wasteful number, since it uses less digits than its factorization.

12780081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420015 (or 1420012 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 12780081 is about 3574.9239152743. The cubic root of 12780081 is about 233.8000154158.

It can be divided in two parts, 127 and 80081, that added together give a palindrome (80208).

The spelling of 12780081 in words is "twelve million, seven hundred eighty thousand, eighty-one".