11118728891 has 2 divisors, whose sum is σ = 11118728892. Its totient is φ = 11118728890.

The previous prime is 11118728843. The next prime is 11118728923. The reversal of 11118728891 is 19882781111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11118728891 - 2¹⁸ = 11118466747 is a prime.

It is a super-2 number, since 2×11118728891² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11118728191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5559364445 + 5559364446.

It is an arithmetic number, because the mean of its divisors is an integer number (5559364446).

Almost surely, 2^11118728891 is an apocalyptic number.

11118728891 is a deficient number, since it is larger than the sum of its proper divisors (1).

11118728891 is an equidigital number, since it uses as much as digits as its factorization.

11118728891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 47.

The spelling of 11118728891 in words is "eleven billion, one hundred eighteen million, seven hundred twenty-eight thousand, eight hundred ninety-one".