1145511313 has 4 divisors (see below), whose sum is σ = 1167124788. Its totient is φ = 1123897840.

The previous prime is 1145511299. The next prime is 1145511329. The reversal of 1145511313 is 3131155411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3131155411 = 1117 ⋅2803183.

It can be written as a sum of positive squares in 2 ways, for example, as 652138369 + 493372944 = 25537^2 + 22212^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1145511313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145511383) 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 3 ways as a sum of consecutive naturals, for example, 10806658 + ... + 10806763.

It is an arithmetic number, because the mean of its divisors is an integer number (291781197).

Almost surely, 2^1145511313 is an apocalyptic number.

It is an amenable number.

1145511313 is a deficient number, since it is larger than the sum of its proper divisors (21613475).

1145511313 is an equidigital number, since it uses as much as digits as its factorization.

1145511313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21613474.

The product of its digits is 900, while the sum is 25.

The square root of 1145511313 is about 33845.4031295241. The cubic root of 1145511313 is about 1046.3246597278.

Adding to 1145511313 its reverse (3131155411), we get a palindrome (4276666724).

The spelling of 1145511313 in words is "one billion, one hundred forty-five million, five hundred eleven thousand, three hundred thirteen".