51306811 has 2 divisors, whose sum is σ = 51306812. Its totient is φ = 51306810.

The previous prime is 51306793. The next prime is 51306841. The reversal of 51306811 is 11860315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51306811 - 2⁷ = 51306683 is a prime.

It is not a weakly prime, because it can be changed into another prime (51306841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25653405 + 25653406.

It is an arithmetic number, because the mean of its divisors is an integer number (25653406).

Almost surely, 2^51306811 is an apocalyptic number.

51306811 is a deficient number, since it is larger than the sum of its proper divisors (1).

51306811 is an equidigital number, since it uses as much as digits as its factorization.

51306811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 51306811 is about 7162.8772850022. The cubic root of 51306811 is about 371.5851423096.

The spelling of 51306811 in words is "fifty-one million, three hundred six thousand, eight hundred eleven".