51171331 has 2 divisors, whose sum is σ = 51171332. Its totient is φ = 51171330.

The previous prime is 51171319. The next prime is 51171353. The reversal of 51171331 is 13317115.

It is an a-pointer prime, because the next prime (51171353) can be obtained adding 51171331 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51171331 - 2⁵ = 51171299 is a prime.

It is a super-2 number, since 2×51171331² = 5237010232623122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51171311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25585665 + 25585666.

It is an arithmetic number, because the mean of its divisors is an integer number (25585666).

Almost surely, 2^51171331 is an apocalyptic number.

51171331 is a deficient number, since it is larger than the sum of its proper divisors (1).

51171331 is an equidigital number, since it uses as much as digits as its factorization.

51171331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 315, while the sum is 22.

The square root of 51171331 is about 7153.4139402106. The cubic root of 51171331 is about 371.2577866083.

Adding to 51171331 its reverse (13317115), we get a palindrome (64488446).

The spelling of 51171331 in words is "fifty-one million, one hundred seventy-one thousand, three hundred thirty-one".