11687591 has 2 divisors, whose sum is σ = 11687592. Its totient is φ = 11687590.

The previous prime is 11687587. The next prime is 11687629. The reversal of 11687591 is 19578611.

It is an a-pointer prime, because the next prime (11687629) can be obtained adding 11687591 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11687591 - 2² = 11687587 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11687521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5843795 + 5843796.

It is an arithmetic number, because the mean of its divisors is an integer number (5843796).

Almost surely, 2^11687591 is an apocalyptic number.

11687591 is a deficient number, since it is larger than the sum of its proper divisors (1).

11687591 is an equidigital number, since it uses as much as digits as its factorization.

11687591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 38.

The square root of 11687591 is about 3418.7118919265. The cubic root of 11687591 is about 226.9385810664.

The spelling of 11687591 in words is "eleven million, six hundred eighty-seven thousand, five hundred ninety-one".