51220777 has 2 divisors, whose sum is σ = 51220778. Its totient is φ = 51220776.

The previous prime is 51220769. The next prime is 51220823. The reversal of 51220777 is 77702215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51036736 + 184041 = 7144^2 + 429^2 .

It is a cyclic number.

It is not a de Polignac number, because 51220777 - 2³ = 51220769 is a prime.

It is not a weakly prime, because it can be changed into another prime (51220717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25610388 + 25610389.

It is an arithmetic number, because the mean of its divisors is an integer number (25610389).

Almost surely, 2^51220777 is an apocalyptic number.

It is an amenable number.

51220777 is a deficient number, since it is larger than the sum of its proper divisors (1).

51220777 is an equidigital number, since it uses as much as digits as its factorization.

51220777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6860, while the sum is 31.

The square root of 51220777 is about 7156.8692177516. The cubic root of 51220777 is about 371.3773281730.

The spelling of 51220777 in words is "fifty-one million, two hundred twenty thousand, seven hundred seventy-seven".