1145709305 has 24 divisors (see below), whose sum is σ = 1576337112. Its totient is φ = 796283904.

The previous prime is 1145709287. The next prime is 1145709319. The reversal of 1145709305 is 5039075411.

1145709305 = 415² + 416² + ... + 1519².

It can be written as a sum of positive squares in 12 ways, for example, as 390339049 + 755370256 = 19757^2 + 27484^2 .

It is not a de Polignac number, because 1145709305 - 2²⁰ = 1144660729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 25514 + ... + 54243.

It is an arithmetic number, because the mean of its divisors is an integer number (65680713).

Almost surely, 2^1145709305 is an apocalyptic number.

It is an amenable number.

1145709305 is a deficient number, since it is larger than the sum of its proper divisors (430627807).

1145709305 is a wasteful number, since it uses less digits than its factorization.

1145709305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79805 (or 79792 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 1145709305 is about 33848.3279498412. The cubic root of 1145709305 is about 1046.3849390620.

The spelling of 1145709305 in words is "one billion, one hundred forty-five million, seven hundred nine thousand, three hundred five".