1085689777 has 2 divisors, whose sum is σ = 1085689778. Its totient is φ = 1085689776.

The previous prime is 1085689771. The next prime is 1085689793. The reversal of 1085689777 is 7779865801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 923916816 + 161772961 = 30396^2 + 12719^2 .

It is an emirp because it is prime and its reverse (7779865801) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1085689777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1085689771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542844888 + 542844889.

It is an arithmetic number, because the mean of its divisors is an integer number (542844889).

Almost surely, 2^1085689777 is an apocalyptic number.

It is an amenable number.

1085689777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085689777 is an equidigital number, since it uses as much as digits as its factorization.

1085689777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5927040, while the sum is 58.

The square root of 1085689777 is about 32949.8069341840. The cubic root of 1085689777 is about 1027.7841505686.

The spelling of 1085689777 in words is "one billion, eighty-five million, six hundred eighty-nine thousand, seven hundred seventy-seven".