51111110100101 has 4 divisors (see below), whose sum is σ = 51120803090412. Its totient is φ = 51101417109792.

The previous prime is 51111110100079. The next prime is 51111110100121. The reversal of 51111110100101 is 10100101111115.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41481663271876 + 9629446828225 = 6440626^2 + 3103135^2 .

It is a cyclic number.

It is not a de Polignac number, because 51111110100101 - 2¹⁴ = 51111110083717 is a prime.

It is a super-2 number, since 2×51111110100101² (a number of 28 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 (51111110100121) 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, 4846487246 + ... + 4846497791.

It is an arithmetic number, because the mean of its divisors is an integer number (12780200772603).

Almost surely, 2^{51111110100101} is an apocalyptic number.

It is an amenable number.

51111110100101 is a deficient number, since it is larger than the sum of its proper divisors (9692990311).

51111110100101 is an equidigital number, since it uses as much as digits as its factorization.

51111110100101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9692990310.

The product of its (nonzero) digits is 5, while the sum is 14.

Adding to 51111110100101 its reverse (10100101111115), we get a palindrome (61211211211216).

The spelling of 51111110100101 in words is "fifty-one trillion, one hundred eleven billion, one hundred ten million, one hundred thousand, one hundred one".