51011101111 has 12 divisors (see below), whose sum is σ = 52922471448. Its totient is φ = 49142044224.

The previous prime is 51011101109. The next prime is 51011101147. The reversal of 51011101111 is 11110111015.

It is not a de Polignac number, because 51011101111 - 2¹ = 51011101109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51011101091 and 51011101100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51011101151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117841 + ... + 340453.

It is an arithmetic number, because the mean of its divisors is an integer number (4410205954).

Almost surely, 2^51011101111 is an apocalyptic number.

51011101111 is a deficient number, since it is larger than the sum of its proper divisors (1911370337).

51011101111 is an equidigital number, since it uses as much as digits as its factorization.

51011101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222802 (or 222729 counting only the distinct ones).

The product of its (nonzero) digits is 5, while the sum is 13.

Adding to 51011101111 its reverse (11110111015), we get a palindrome (62121212126).

The spelling of 51011101111 in words is "fifty-one billion, eleven million, one hundred one thousand, one hundred eleven".