51711111 has 6 divisors (see below), whose sum is σ = 74693840. Its totient is φ = 34474068.

The previous prime is 51711053. The next prime is 51711133. The reversal of 51711111 is 11111715.

It is not a de Polignac number, because 51711111 - 2¹⁵ = 51678343 is a prime.

It is a Duffinian number.

51711111 is a modest number, since divided by 11111 gives 517 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51711151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2872831 + ... + 2872848.

Almost surely, 2^51711111 is an apocalyptic number.

51711111 is a deficient number, since it is larger than the sum of its proper divisors (22982729).

51711111 is a wasteful number, since it uses less digits than its factorization.

51711111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5745685 (or 5745682 counting only the distinct ones).

The product of its digits is 35, while the sum is 18.

The square root of 51711111 is about 7191.0438046225. The cubic root of 51711111 is about 372.5586256691.

Adding to 51711111 its reverse (11111715), we get a palindrome (62822826).

It can be divided in two parts, 517 and 11111, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 51711111 in words is "fifty-one million, seven hundred eleven thousand, one hundred eleven".