1385805517 has 2 divisors, whose sum is σ = 1385805518. Its totient is φ = 1385805516.

The previous prime is 1385805467. The next prime is 1385805521. The reversal of 1385805517 is 7155085831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1274418601 + 111386916 = 35699^2 + 10554^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385805517 - 2⁷ = 1385805389 is a prime.

It is a super-3 number, since 3×1385805517³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1385805217) 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, 692902758 + 692902759.

It is an arithmetic number, because the mean of its divisors is an integer number (692902759).

Almost surely, 2^1385805517 is an apocalyptic number.

It is an amenable number.

1385805517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385805517 is an equidigital number, since it uses as much as digits as its factorization.

1385805517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168000, while the sum is 43.

The square root of 1385805517 is about 37226.4088652129. The cubic root of 1385805517 is about 1114.8953274353.

The spelling of 1385805517 in words is "one billion, three hundred eighty-five million, eight hundred five thousand, five hundred seventeen".