11787691 has 2 divisors, whose sum is σ = 11787692. Its totient is φ = 11787690.

The previous prime is 11787689. The next prime is 11787739. The reversal of 11787691 is 19678711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11787691 - 2¹ = 11787689 is a prime.

It is a super-2 number, since 2×11787691² = 277899318222962, which contains 22 as substring.

Together with 11787689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11787631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5893845 + 5893846.

It is an arithmetic number, because the mean of its divisors is an integer number (5893846).

Almost surely, 2^11787691 is an apocalyptic number.

11787691 is a deficient number, since it is larger than the sum of its proper divisors (1).

11787691 is an equidigital number, since it uses as much as digits as its factorization.

11787691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 40.

The square root of 11787691 is about 3433.3206957696. The cubic root of 11787691 is about 227.5846225466.

The spelling of 11787691 in words is "eleven million, seven hundred eighty-seven thousand, six hundred ninety-one".