11091284551 has 4 divisors (see below), whose sum is σ = 11743713072. Its totient is φ = 10438856032.

The previous prime is 11091284521. The next prime is 11091284569. The reversal of 11091284551 is 15548219011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15548219011 = 13 ⋅1196016847.

It is a cyclic number.

It is not a de Polignac number, because 11091284551 - 2¹³ = 11091276359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11091284551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11091284521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326214235 + ... + 326214268.

It is an arithmetic number, because the mean of its divisors is an integer number (2935928268).

Almost surely, 2^11091284551 is an apocalyptic number.

11091284551 is a deficient number, since it is larger than the sum of its proper divisors (652428521).

11091284551 is an equidigital number, since it uses as much as digits as its factorization.

11091284551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652428520.

The product of its (nonzero) digits is 14400, while the sum is 37.

The spelling of 11091284551 in words is "eleven billion, ninety-one million, two hundred eighty-four thousand, five hundred fifty-one".