1145661313 has 4 divisors (see below), whose sum is σ = 1164442708. Its totient is φ = 1126879920.

The previous prime is 1145661271. The next prime is 1145661323. The reversal of 1145661313 is 3131665411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 441714289 + 703947024 = 21017^2 + 26532^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145661313 - 2⁹ = 1145660801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145661323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9390606 + ... + 9390727.

It is an arithmetic number, because the mean of its divisors is an integer number (291110677).

Almost surely, 2^1145661313 is an apocalyptic number.

It is an amenable number.

1145661313 is a deficient number, since it is larger than the sum of its proper divisors (18781395).

1145661313 is an equidigital number, since it uses as much as digits as its factorization.

1145661313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18781394.

The product of its digits is 6480, while the sum is 31.

The square root of 1145661313 is about 33847.6190152276. The cubic root of 1145661313 is about 1046.3703283729.

The spelling of 1145661313 in words is "one billion, one hundred forty-five million, six hundred sixty-one thousand, three hundred thirteen".