11971567 has 2 divisors, whose sum is σ = 11971568. Its totient is φ = 11971566.

The previous prime is 11971541. The next prime is 11971607. The reversal of 11971567 is 76517911.

It is a weak prime.

It is an emirp because it is prime and its reverse (76517911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11971567 - 2⁷ = 11971439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11971517) 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, 5985783 + 5985784.

It is an arithmetic number, because the mean of its divisors is an integer number (5985784).

Almost surely, 2^11971567 is an apocalyptic number.

11971567 is a deficient number, since it is larger than the sum of its proper divisors (1).

11971567 is an equidigital number, since it uses as much as digits as its factorization.

11971567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13230, while the sum is 37.

The square root of 11971567 is about 3459.9952312106. The cubic root of 11971567 is about 228.7618851758.

The spelling of 11971567 in words is "eleven million, nine hundred seventy-one thousand, five hundred sixty-seven".