51320777 has 2 divisors, whose sum is σ = 51320778. Its totient is φ = 51320776.

The previous prime is 51320761. The next prime is 51320803. The reversal of 51320777 is 77702315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28558336 + 22762441 = 5344^2 + 4771^2 .

It is a cyclic number.

It is not a de Polignac number, because 51320777 - 2⁴ = 51320761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51320077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25660388 + 25660389.

It is an arithmetic number, because the mean of its divisors is an integer number (25660389).

Almost surely, 2^51320777 is an apocalyptic number.

It is an amenable number.

51320777 is a deficient number, since it is larger than the sum of its proper divisors (1).

51320777 is an equidigital number, since it uses as much as digits as its factorization.

51320777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 51320777 is about 7163.8521062345. The cubic root of 51320777 is about 371.6188550999.

The spelling of 51320777 in words is "fifty-one million, three hundred twenty thousand, seven hundred seventy-seven".