51644777 has 2 divisors, whose sum is σ = 51644778. Its totient is φ = 51644776.

The previous prime is 51644771. The next prime is 51644783. The reversal of 51644777 is 77744615.

It is a balanced prime because it is at equal distance from previous prime (51644771) and next prime (51644783).

It can be written as a sum of positive squares in only one way, i.e., 38241856 + 13402921 = 6184^2 + 3661^2 .

It is a cyclic number.

It is not a de Polignac number, because 51644777 - 2⁶ = 51644713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51644771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822388 + 25822389.

It is an arithmetic number, because the mean of its divisors is an integer number (25822389).

Almost surely, 2^51644777 is an apocalyptic number.

It is an amenable number.

51644777 is a deficient number, since it is larger than the sum of its proper divisors (1).

51644777 is an equidigital number, since it uses as much as digits as its factorization.

51644777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164640, while the sum is 41.

The square root of 51644777 is about 7186.4300594941. The cubic root of 51644777 is about 372.3992538682.

The spelling of 51644777 in words is "fifty-one million, six hundred forty-four thousand, seven hundred seventy-seven".