51122171 has 2 divisors, whose sum is σ = 51122172. Its totient is φ = 51122170.

The previous prime is 51122167. The next prime is 51122177. The reversal of 51122171 is 17122115.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51122171 - 2² = 51122167 is a prime.

It is a super-2 number, since 2×51122171² = 5226952735506482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51122177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25561085 + 25561086.

It is an arithmetic number, because the mean of its divisors is an integer number (25561086).

Almost surely, 2^51122171 is an apocalyptic number.

51122171 is a deficient number, since it is larger than the sum of its proper divisors (1).

51122171 is an equidigital number, since it uses as much as digits as its factorization.

51122171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 140, while the sum is 20.

The square root of 51122171 is about 7149.9769929700. The cubic root of 51122171 is about 371.1388601175.

Adding to 51122171 its reverse (17122115), we get a palindrome (68244286).

The spelling of 51122171 in words is "fifty-one million, one hundred twenty-two thousand, one hundred seventy-one".