51155331213 has 16 divisors (see below), whose sum is σ = 77957857280. Its totient is φ = 29229039216.

The previous prime is 51155331211. The next prime is 51155331221. The reversal of 51155331213 is 31213355115.

It is not a de Polignac number, because 51155331213 - 2¹ = 51155331211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155331211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150708 + ... + 353586.

It is an arithmetic number, because the mean of its divisors is an integer number (4872366080).

Almost surely, 2^51155331213 is an apocalyptic number.

It is an amenable number.

51155331213 is a deficient number, since it is larger than the sum of its proper divisors (26802526067).

51155331213 is a wasteful number, since it uses less digits than its factorization.

51155331213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214896.

The product of its digits is 6750, while the sum is 30.

Adding to 51155331213 its reverse (31213355115), we get a palindrome (82368686328).

The spelling of 51155331213 in words is "fifty-one billion, one hundred fifty-five million, three hundred thirty-one thousand, two hundred thirteen".