1085438689 has 2 divisors, whose sum is σ = 1085438690. Its totient is φ = 1085438688.

The previous prime is 1085438687. The next prime is 1085438713. The reversal of 1085438689 is 9868345801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 989731600 + 95707089 = 31460^2 + 9783^2 .

It is a cyclic number.

It is not a de Polignac number, because 1085438689 - 2¹ = 1085438687 is a prime.

Together with 1085438687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1085438687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542719344 + 542719345.

It is an arithmetic number, because the mean of its divisors is an integer number (542719345).

Almost surely, 2^1085438689 is an apocalyptic number.

It is an amenable number.

1085438689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085438689 is an equidigital number, since it uses as much as digits as its factorization.

1085438689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The square root of 1085438689 is about 32945.9965549686. The cubic root of 1085438689 is about 1027.7049124139.

The spelling of 1085438689 in words is "one billion, eighty-five million, four hundred thirty-eight thousand, six hundred eighty-nine".