51214181 has 2 divisors, whose sum is σ = 51214182. Its totient is φ = 51214180.

The previous prime is 51214129. The next prime is 51214211. The reversal of 51214181 is 18141215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28793956 + 22420225 = 5366^2 + 4735^2 .

It is a cyclic number.

It is not a de Polignac number, because 51214181 - 2¹⁸ = 50952037 is a prime.

It is a super-2 number, since 2×51214181² = 5245784671001522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51214981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25607090 + 25607091.

It is an arithmetic number, because the mean of its divisors is an integer number (25607091).

Almost surely, 2^51214181 is an apocalyptic number.

It is an amenable number.

51214181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51214181 is an equidigital number, since it uses as much as digits as its factorization.

51214181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 23.

The square root of 51214181 is about 7156.4083868935. The cubic root of 51214181 is about 371.3613860094.

Adding to 51214181 its reverse (18141215), we get a palindrome (69355396).

The spelling of 51214181 in words is "fifty-one million, two hundred fourteen thousand, one hundred eighty-one".