1305161985 has 8 divisors (see below), whose sum is σ = 2088259200. Its totient is φ = 696086384.

The previous prime is 1305161981. The next prime is 1305161989. The reversal of 1305161985 is 5891615031.

It is an interprime number because it is at equal distance from previous prime (1305161981) and next prime (1305161989).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1305161985 - 2² = 1305161981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1305161981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43505385 + ... + 43505414.

It is an arithmetic number, because the mean of its divisors is an integer number (261032400).

Almost surely, 2^1305161985 is an apocalyptic number.

1305161985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1305161985 is a deficient number, since it is larger than the sum of its proper divisors (783097215).

1305161985 is an equidigital number, since it uses as much as digits as its factorization.

1305161985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87010807.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 1305161985 is about 36127.0256871501. The cubic root of 1305161985 is about 1092.8355275074.

The spelling of 1305161985 in words is "one billion, three hundred five million, one hundred sixty-one thousand, nine hundred eighty-five".