51111055001 has 4 divisors (see below), whose sum is σ = 51111512100. Its totient is φ = 51110597904.

The previous prime is 51111054991. The next prime is 51111055003. The reversal of 51111055001 is 10055011115.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10852638976 + 40258416025 = 104176^2 + 200645^2 .

It is a cyclic number.

It is not a de Polignac number, because 51111055001 - 2¹⁴ = 51111038617 is a prime.

It is a super-2 number, since 2×51111055001² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51111055003) 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, 63995 + ... + 326063.

It is an arithmetic number, because the mean of its divisors is an integer number (12777878025).

Almost surely, 2^51111055001 is an apocalyptic number.

It is an amenable number.

51111055001 is a deficient number, since it is larger than the sum of its proper divisors (457099).

51111055001 is a wasteful number, since it uses less digits than its factorization.

51111055001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457098.

The product of its (nonzero) digits is 125, while the sum is 20.

Adding to 51111055001 its reverse (10055011115), we get a palindrome (61166066116).

The spelling of 51111055001 in words is "fifty-one billion, one hundred eleven million, fifty-five thousand, one".