11154991 has 2 divisors, whose sum is σ = 11154992. Its totient is φ = 11154990.

The previous prime is 11154989. The next prime is 11155049. The reversal of 11154991 is 19945111.

It is a weak prime.

It is an emirp because it is prime and its reverse (19945111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11154991 - 2¹ = 11154989 is a prime.

Together with 11154989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11154961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5577495 + 5577496.

It is an arithmetic number, because the mean of its divisors is an integer number (5577496).

Almost surely, 2^11154991 is an apocalyptic number.

11154991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11154991 is an equidigital number, since it uses as much as digits as its factorization.

11154991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 31.

The square root of 11154991 is about 3339.9088310911. The cubic root of 11154991 is about 223.4376772881.

The spelling of 11154991 in words is "eleven million, one hundred fifty-four thousand, nine hundred ninety-one".