47111111 has 4 divisors (see below), whose sum is σ = 47140632. Its totient is φ = 47081592.

The previous prime is 47111083. The next prime is 47111143. The reversal of 47111111 is 11111174.

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 47111111 - 2⁶ = 47111047 is a prime.

It is a Duffinian number.

47111111 is a modest number, since divided by 11111 gives 471 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 47111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47111611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12221 + ... + 15606.

It is an arithmetic number, because the mean of its divisors is an integer number (11785158).

Almost surely, 2^47111111 is an apocalyptic number.

47111111 is a deficient number, since it is larger than the sum of its proper divisors (29521).

47111111 is a wasteful number, since it uses less digits than its factorization.

47111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29520.

The product of its digits is 28, while the sum is 17.

The square root of 47111111 is about 6863.7534192306. The cubic root of 47111111 is about 361.1667673812.

Adding to 47111111 its reverse (11111174), we get a palindrome (58222285).

The spelling of 47111111 in words is "forty-seven million, one hundred eleven thousand, one hundred eleven".