11871091 has 2 divisors, whose sum is σ = 11871092. Its totient is φ = 11871090.

The previous prime is 11871077. The next prime is 11871103. The reversal of 11871091 is 19017811.

It is a strong prime.

It is an emirp because it is prime and its reverse (19017811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11871091 - 2¹⁷ = 11740019 is a prime.

It is not a weakly prime, because it can be changed into another prime (11871061) 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, 5935545 + 5935546.

It is an arithmetic number, because the mean of its divisors is an integer number (5935546).

Almost surely, 2^11871091 is an apocalyptic number.

11871091 is a deficient number, since it is larger than the sum of its proper divisors (1).

11871091 is an equidigital number, since it uses as much as digits as its factorization.

11871091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 11871091 is about 3445.4449640068. Note that the first 3 decimals coincide. The cubic root of 11871091 is about 228.1200954972.

It can be divided in two parts, 1187 and 1091, that added together give a triangular number (2278 = T₆₇).

The spelling of 11871091 in words is "eleven million, eight hundred seventy-one thousand, ninety-one".