11806513 has 2 divisors, whose sum is σ = 11806514. Its totient is φ = 11806512.

The previous prime is 11806511. The next prime is 11806537. The reversal of 11806513 is 31560811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11778624 + 27889 = 3432^2 + 167^2 .

It is a cyclic number.

It is not a de Polignac number, because 11806513 - 2¹ = 11806511 is a prime.

Together with 11806511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11806511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5903256 + 5903257.

It is an arithmetic number, because the mean of its divisors is an integer number (5903257).

Almost surely, 2^11806513 is an apocalyptic number.

It is an amenable number.

11806513 is a deficient number, since it is larger than the sum of its proper divisors (1).

11806513 is an equidigital number, since it uses as much as digits as its factorization.

11806513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 11806513 is about 3436.0606804886. The cubic root of 11806513 is about 227.7056900749.

The spelling of 11806513 in words is "eleven million, eight hundred six thousand, five hundred thirteen".