51440777 has 2 divisors, whose sum is σ = 51440778. Its totient is φ = 51440776.

The previous prime is 51440737. The next prime is 51440783. The reversal of 51440777 is 77704415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31629376 + 19811401 = 5624^2 + 4451^2 .

It is a cyclic number.

It is not a de Polignac number, because 51440777 - 2⁶ = 51440713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51440737) 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, 25720388 + 25720389.

It is an arithmetic number, because the mean of its divisors is an integer number (25720389).

Almost surely, 2^51440777 is an apocalyptic number.

It is an amenable number.

51440777 is a deficient number, since it is larger than the sum of its proper divisors (1).

51440777 is an equidigital number, since it uses as much as digits as its factorization.

51440777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27440, while the sum is 35.

The square root of 51440777 is about 7172.2225983303. Note that the first 3 decimals coincide. The cubic root of 51440777 is about 371.9082736228.

The spelling of 51440777 in words is "fifty-one million, four hundred forty thousand, seven hundred seventy-seven".