61820777 has 2 divisors, whose sum is σ = 61820778. Its totient is φ = 61820776.

The previous prime is 61820771. The next prime is 61820797. The reversal of 61820777 is 77702816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36529936 + 25290841 = 6044^2 + 5029^2 .

It is a cyclic number.

It is not a de Polignac number, because 61820777 - 2⁴ = 61820761 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61820777.

It is not a weakly prime, because it can be changed into another prime (61820771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30910388 + 30910389.

It is an arithmetic number, because the mean of its divisors is an integer number (30910389).

Almost surely, 2^61820777 is an apocalyptic number.

It is an amenable number.

61820777 is a deficient number, since it is larger than the sum of its proper divisors (1).

61820777 is an equidigital number, since it uses as much as digits as its factorization.

61820777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 61820777 is about 7862.6189657137. The cubic root of 61820777 is about 395.4074245123.

The spelling of 61820777 in words is "sixty-one million, eight hundred twenty thousand, seven hundred seventy-seven".