51331155111 has 8 divisors (see below), whose sum is σ = 76046155760. Its totient is φ = 34220770056.

The previous prime is 51331155101. The next prime is 51331155137. The reversal of 51331155111 is 11155113315.

51331155111 is a `hidden beast` number, since 5 + 1 + 33 + 115 + 511 + 1 = 666.

It is not a de Polignac number, because 51331155111 - 2¹⁰ = 51331154087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1901153893 = 51331155111 / (5 + 1 + 3 + 3 + 1 + 1 + 5 + 5 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51331155101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950576920 + ... + 950576973.

It is an arithmetic number, because the mean of its divisors is an integer number (9505769470).

Almost surely, 2^51331155111 is an apocalyptic number.

51331155111 is a deficient number, since it is larger than the sum of its proper divisors (24715000649).

51331155111 is a wasteful number, since it uses less digits than its factorization.

51331155111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901153902 (or 1901153896 counting only the distinct ones).

The product of its digits is 1125, while the sum is 27.

Adding to 51331155111 its reverse (11155113315), we get a palindrome (62486268426).

The spelling of 51331155111 in words is "fifty-one billion, three hundred thirty-one million, one hundred fifty-five thousand, one hundred eleven".