11027991 has 8 divisors (see below), whose sum is σ = 15835120. Its totient is φ = 6786432.

The previous prime is 11027981. The next prime is 11027993. The reversal of 11027991 is 19972011.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11027991 - 2⁵ = 11027959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11027993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141346 + ... + 141423.

It is an arithmetic number, because the mean of its divisors is an integer number (1979390).

Almost surely, 2^11027991 is an apocalyptic number.

11027991 is a deficient number, since it is larger than the sum of its proper divisors (4807129).

11027991 is a wasteful number, since it uses less digits than its factorization.

11027991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282785.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 11027991 is about 3320.8419113231. The cubic root of 11027991 is about 222.5864899624.

The spelling of 11027991 in words is "eleven million, twenty-seven thousand, nine hundred ninety-one".