51211117 has 2 divisors, whose sum is σ = 51211118. Its totient is φ = 51211116.

The previous prime is 51211109. The next prime is 51211159. The reversal of 51211117 is 71111215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49646116 + 1565001 = 7046^2 + 1251^2 .

It is a cyclic number.

It is not a de Polignac number, because 51211117 - 2³ = 51211109 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51211094 and 51211103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51211217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25605558 + 25605559.

It is an arithmetic number, because the mean of its divisors is an integer number (25605559).

Almost surely, 2^51211117 is an apocalyptic number.

It is an amenable number.

51211117 is a deficient number, since it is larger than the sum of its proper divisors (1).

51211117 is an equidigital number, since it uses as much as digits as its factorization.

51211117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70, while the sum is 19.

The square root of 51211117 is about 7156.1943098270. The cubic root of 51211117 is about 371.3539800270.

The spelling of 51211117 in words is "fifty-one million, two hundred eleven thousand, one hundred seventeen".