51111012111 has 24 divisors (see below), whose sum is σ = 72232570800. Its totient is φ = 32141937024.

The previous prime is 51111012079. The next prime is 51111012133. The reversal of 51111012111 is 11121011115.

It is not a de Polignac number, because 51111012111 - 2⁵ = 51111012079 is a prime.

It is a super-2 number, since 2×51111012111² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111012811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151065 + ... + 353613.

It is an arithmetic number, because the mean of its divisors is an integer number (3009690450).

Almost surely, 2^51111012111 is an apocalyptic number.

51111012111 is a deficient number, since it is larger than the sum of its proper divisors (21121558689).

51111012111 is a wasteful number, since it uses less digits than its factorization.

51111012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202823 (or 202804 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 15.

Adding to 51111012111 its reverse (11121011115), we get a palindrome (62232023226).

The spelling of 51111012111 in words is "fifty-one billion, one hundred eleven million, twelve thousand, one hundred eleven".