11091551 has 2 divisors, whose sum is σ = 11091552. Its totient is φ = 11091550.

The previous prime is 11091529. The next prime is 11091581. The reversal of 11091551 is 15519011.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11091551 - 2¹⁸ = 10829407 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 (11091511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5545775 + 5545776.

It is an arithmetic number, because the mean of its divisors is an integer number (5545776).

Almost surely, 2^11091551 is an apocalyptic number.

11091551 is a deficient number, since it is larger than the sum of its proper divisors (1).

11091551 is an equidigital number, since it uses as much as digits as its factorization.

11091551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225, while the sum is 23.

The square root of 11091551 is about 3330.3980242608. The cubic root of 11091551 is about 223.0132979529.

The spelling of 11091551 in words is "eleven million, ninety-one thousand, five hundred fifty-one".