51281311 has 2 divisors, whose sum is σ = 51281312. Its totient is φ = 51281310.

The previous prime is 51281273. The next prime is 51281317. The reversal of 51281311 is 11318215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51281311 - 2⁹ = 51280799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51281317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25640655 + 25640656.

It is an arithmetic number, because the mean of its divisors is an integer number (25640656).

Almost surely, 2^51281311 is an apocalyptic number.

51281311 is a deficient number, since it is larger than the sum of its proper divisors (1).

51281311 is an equidigital number, since it uses as much as digits as its factorization.

51281311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 22.

The square root of 51281311 is about 7161.0970528265. The cubic root of 51281311 is about 371.5235715930.

Adding to 51281311 its reverse (11318215), we get a palindrome (62599526).

The spelling of 51281311 in words is "fifty-one million, two hundred eighty-one thousand, three hundred eleven".