1305011085 has 32 divisors (see below), whose sum is σ = 2441809920. Its totient is φ = 582700608.

The previous prime is 1305011039. The next prime is 1305011087. The reversal of 1305011085 is 5801105031.

It is not a de Polignac number, because 1305011085 - 2⁶ = 1305011021 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305011087) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140005 + ... + 149034.

It is an arithmetic number, because the mean of its divisors is an integer number (76306560).

Almost surely, 2^1305011085 is an apocalyptic number.

1305011085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1305011085 is a deficient number, since it is larger than the sum of its proper divisors (1136798835).

1305011085 is a wasteful number, since it uses less digits than its factorization.

1305011085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289097.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 1305011085 is about 36124.9371625751. The cubic root of 1305011085 is about 1092.7934087924.

The spelling of 1305011085 in words is "one billion, three hundred five million, eleven thousand, eighty-five".