51278911 has 2 divisors, whose sum is σ = 51278912. Its totient is φ = 51278910.

The previous prime is 51278893. The next prime is 51278933. The reversal of 51278911 is 11987215.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51278911 - 2⁵ = 51278879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51278971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25639455 + 25639456.

It is an arithmetic number, because the mean of its divisors is an integer number (25639456).

Almost surely, 2^51278911 is an apocalyptic number.

51278911 is a deficient number, since it is larger than the sum of its proper divisors (1).

51278911 is an equidigital number, since it uses as much as digits as its factorization.

51278911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 34.

The square root of 51278911 is about 7160.9294787758. The cubic root of 51278911 is about 371.5177756512.

The spelling of 51278911 in words is "fifty-one million, two hundred seventy-eight thousand, nine hundred eleven".