11947111 has 4 divisors (see below), whose sum is σ = 13033224. Its totient is φ = 10861000.

The previous prime is 11947081. The next prime is 11947123. The reversal of 11947111 is 11174911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11947111 - 2⁵ = 11947079 is a prime.

It is a super-2 number, since 2×11947111² = 285466922492642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11947711) 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 in 3 ways as a sum of consecutive naturals, for example, 543040 + ... + 543061.

It is an arithmetic number, because the mean of its divisors is an integer number (3258306).

Almost surely, 2^11947111 is an apocalyptic number.

11947111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11947111 is a deficient number, since it is larger than the sum of its proper divisors (1086113).

11947111 is a wasteful number, since it uses less digits than its factorization.

11947111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086112.

The product of its digits is 252, while the sum is 25.

The square root of 11947111 is about 3456.4593155424. The cubic root of 11947111 is about 228.6060043119.

The spelling of 11947111 in words is "eleven million, nine hundred forty-seven thousand, one hundred eleven".