11279991 has 8 divisors (see below), whose sum is σ = 15055744. Its totient is φ = 7512120.

The previous prime is 11279981. The next prime is 11280007. The reversal of 11279991 is 19997211.

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

It is not a de Polignac number, because 11279991 - 2⁹ = 11279479 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 (11279911) 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, 3726 + ... + 6036.

It is an arithmetic number, because the mean of its divisors is an integer number (1881968).

Almost surely, 2^11279991 is an apocalyptic number.

11279991 is a deficient number, since it is larger than the sum of its proper divisors (3775753).

11279991 is a wasteful number, since it uses less digits than its factorization.

11279991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941.

The product of its digits is 10206, while the sum is 39.

The square root of 11279991 is about 3358.5697848936. The cubic root of 11279991 is about 224.2691744447.

The spelling of 11279991 in words is "eleven million, two hundred seventy-nine thousand, nine hundred ninety-one".