1145647273 has 4 divisors (see below), whose sum is σ = 1195458048. Its totient is φ = 1095836500.

The previous prime is 1145647247. The next prime is 1145647277. The reversal of 1145647273 is 3727465411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3727465411 = 23087 ⋅161453.

It is a cyclic number.

It is not a de Polignac number, because 1145647273 - 2⁵ = 1145647241 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145647277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24905353 + ... + 24905398.

It is an arithmetic number, because the mean of its divisors is an integer number (298864512).

Almost surely, 2^1145647273 is an apocalyptic number.

It is an amenable number.

1145647273 is a deficient number, since it is larger than the sum of its proper divisors (49810775).

1145647273 is an equidigital number, since it uses as much as digits as its factorization.

1145647273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49810774.

The product of its digits is 141120, while the sum is 40.

The square root of 1145647273 is about 33847.4116144795. The cubic root of 1145647273 is about 1046.3660539568.

The spelling of 1145647273 in words is "one billion, one hundred forty-five million, six hundred forty-seven thousand, two hundred seventy-three".