51103211311 has 4 divisors (see below), whose sum is σ = 51103928272. Its totient is φ = 51102494352.

The previous prime is 51103211279. The next prime is 51103211339. The reversal of 51103211311 is 11311230115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51103211311 - 2⁵ = 51103211279 is a prime.

It is a super-2 number, since 2×51103211311² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51103211351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238086 + ... + 398611.

It is an arithmetic number, because the mean of its divisors is an integer number (12775982068).

Almost surely, 2^51103211311 is an apocalyptic number.

51103211311 is a deficient number, since it is larger than the sum of its proper divisors (716961).

51103211311 is an equidigital number, since it uses as much as digits as its factorization.

51103211311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716960.

The product of its (nonzero) digits is 90, while the sum is 19.

Adding to 51103211311 its reverse (11311230115), we get a palindrome (62414441426).

The spelling of 51103211311 in words is "fifty-one billion, one hundred three million, two hundred eleven thousand, three hundred eleven".