1085809903 has 2 divisors, whose sum is σ = 1085809904. Its totient is φ = 1085809902.

The previous prime is 1085809877. The next prime is 1085809913. The reversal of 1085809903 is 3099085801.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1085809903 - 2⁵ = 1085809871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1085809903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1085809913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542904951 + 542904952.

It is an arithmetic number, because the mean of its divisors is an integer number (542904952).

Almost surely, 2^1085809903 is an apocalyptic number.

1085809903 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085809903 is an equidigital number, since it uses as much as digits as its factorization.

1085809903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 1085809903 is about 32951.6297472523. The cubic root of 1085809903 is about 1027.8220555172.

The spelling of 1085809903 in words is "one billion, eighty-five million, eight hundred nine thousand, nine hundred three".