11687811 has 16 divisors (see below), whose sum is σ = 16012416. Its totient is φ = 7580736.

The previous prime is 11687803. The next prime is 11687827. The reversal of 11687811 is 11878611.

11687811 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11687811 - 2³ = 11687803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11687801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17856 + ... + 18498.

It is an arithmetic number, because the mean of its divisors is an integer number (1000776).

Almost surely, 2^11687811 is an apocalyptic number.

11687811 is a deficient number, since it is larger than the sum of its proper divisors (4324605).

11687811 is an equidigital number, since it uses as much as digits as its factorization.

11687811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802.

The product of its digits is 2688, while the sum is 33.

The square root of 11687811 is about 3418.7440676365. The cubic root of 11687811 is about 226.9400049747.

The spelling of 11687811 in words is "eleven million, six hundred eighty-seven thousand, eight hundred eleven".