11191591 has 2 divisors, whose sum is σ = 11191592. Its totient is φ = 11191590.

The previous prime is 11191577. The next prime is 11191597. The reversal of 11191591 is 19519111.

It is a happy number.

11191591 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11191591 - 2⁷ = 11191463 is a prime.

It is a super-2 number, since 2×11191591² = 250503418222562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11191597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5595795 + 5595796.

It is an arithmetic number, because the mean of its divisors is an integer number (5595796).

Almost surely, 2^11191591 is an apocalyptic number.

11191591 is a deficient number, since it is larger than the sum of its proper divisors (1).

11191591 is an equidigital number, since it uses as much as digits as its factorization.

11191591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 405, while the sum is 28.

The square root of 11191591 is about 3345.3835355606. The cubic root of 11191591 is about 223.6817800200.

The spelling of 11191591 in words is "eleven million, one hundred ninety-one thousand, five hundred ninety-one".