51000111 has 14 divisors (see below), whose sum is σ = 76466280. Its totient is φ = 33999588.

The previous prime is 51000083. The next prime is 51000113. The reversal of 51000111 is 11100015.

51000111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-51000111 is a prime.

It is a super-2 number, since 2×51000111² = 5202022644024642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

51000111 is a modest number, since divided by 111 gives 51 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 51000093 and 51000102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000113) 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 13 ways as a sum of consecutive naturals, for example, 34251 + ... + 35708.

Almost surely, 2^51000111 is an apocalyptic number.

51000111 is a deficient number, since it is larger than the sum of its proper divisors (25466169).

51000111 is an frugal number, since it uses more digits than its factorization.

51000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69977 (or 69962 counting only the distinct ones).

The product of its (nonzero) digits is 5, while the sum is 9.

The square root of 51000111 is about 7141.4362000931. The cubic root of 51000111 is about 370.8432459694.

Adding to 51000111 its reverse (11100015), we get a palindrome (62100126).

The spelling of 51000111 in words is "fifty-one million, one hundred eleven", and thus it is an aban number.