1165385779 has 2 divisors, whose sum is σ = 1165385780. Its totient is φ = 1165385778.

The previous prime is 1165385777. The next prime is 1165385849. The reversal of 1165385779 is 9775835611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1165385779 - 2¹ = 1165385777 is a prime.

Together with 1165385777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1165385777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582692889 + 582692890.

It is an arithmetic number, because the mean of its divisors is an integer number (582692890).

Almost surely, 2^1165385779 is an apocalyptic number.

1165385779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165385779 is an equidigital number, since it uses as much as digits as its factorization.

1165385779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1587600, while the sum is 52.

The square root of 1165385779 is about 34137.7471283622. The cubic root of 1165385779 is about 1052.3411943811.

The spelling of 1165385779 in words is "one billion, one hundred sixty-five million, three hundred eighty-five thousand, seven hundred seventy-nine".