11780081 has 2 divisors, whose sum is σ = 11780082. Its totient is φ = 11780080.

The previous prime is 11780077. The next prime is 11780101. The reversal of 11780081 is 18008711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10240000 + 1540081 = 3200^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 11780081 - 2² = 11780077 is a prime.

It is a super-2 number, since 2×11780081² = 277540616733122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11780081.

It is not a weakly prime, because it can be changed into another prime (11780011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5890040 + 5890041.

It is an arithmetic number, because the mean of its divisors is an integer number (5890041).

Almost surely, 2^11780081 is an apocalyptic number.

It is an amenable number.

11780081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11780081 is an equidigital number, since it uses as much as digits as its factorization.

11780081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 26.

The square root of 11780081 is about 3432.2122603359. The cubic root of 11780081 is about 227.5356366506.

Adding to 11780081 its reverse (18008711), we get a palindrome (29788792).

The spelling of 11780081 in words is "eleven million, seven hundred eighty thousand, eighty-one".