51155311 has 2 divisors, whose sum is σ = 51155312. Its totient is φ = 51155310.

The previous prime is 51155297. The next prime is 51155347. The reversal of 51155311 is 11355115.

51155311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51155311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51155711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25577655 + 25577656.

It is an arithmetic number, because the mean of its divisors is an integer number (25577656).

Almost surely, 2^51155311 is an apocalyptic number.

51155311 is a deficient number, since it is larger than the sum of its proper divisors (1).

51155311 is an equidigital number, since it uses as much as digits as its factorization.

51155311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 375, while the sum is 22.

The square root of 51155311 is about 7152.2941074875. The cubic root of 51155311 is about 371.2190398439.

It can be divided in two parts, 511 and 55311, that multiplied together give a triangular number (28263921 = T₇₅₁₈).

The spelling of 51155311 in words is "fifty-one million, one hundred fifty-five thousand, three hundred eleven".