10891591 has 2 divisors, whose sum is σ = 10891592. Its totient is φ = 10891590.

The previous prime is 10891589. The next prime is 10891649. The reversal of 10891591 is 19519801.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10891591 - 2¹ = 10891589 is a prime.

It is a super-2 number, since 2×10891591² = 237253509022562, which contains 22 as substring.

Together with 10891589, it forms a pair of twin primes.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10891511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5445795 + 5445796.

It is an arithmetic number, because the mean of its divisors is an integer number (5445796).

Almost surely, 2^10891591 is an apocalyptic number.

10891591 is a deficient number, since it is larger than the sum of its proper divisors (1).

10891591 is an equidigital number, since it uses as much as digits as its factorization.

10891591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 10891591 is about 3300.2410518021. The cubic root of 10891591 is about 221.6649912876.

The spelling of 10891591 in words is "ten million, eight hundred ninety-one thousand, five hundred ninety-one".