51018871 has 2 divisors, whose sum is σ = 51018872. Its totient is φ = 51018870.

The previous prime is 51018841. The next prime is 51018881. The reversal of 51018871 is 17881015.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51018871 is a prime.

It is a super-2 number, since 2×51018871² = 5205850396229282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51018811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25509435 + 25509436.

It is an arithmetic number, because the mean of its divisors is an integer number (25509436).

Almost surely, 2^51018871 is an apocalyptic number.

51018871 is a deficient number, since it is larger than the sum of its proper divisors (1).

51018871 is an equidigital number, since it uses as much as digits as its factorization.

51018871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 31.

The square root of 51018871 is about 7142.7495406181. The cubic root of 51018871 is about 370.8887110105. Note that the first 3 decimals are identical.

Adding to 51018871 its reverse (17881015), we get a palindrome (68899886).

The spelling of 51018871 in words is "fifty-one million, eighteen thousand, eight hundred seventy-one".