1145320123 has 4 divisors (see below), whose sum is σ = 1146612240. Its totient is φ = 1144028008.

The previous prime is 1145320097. The next prime is 1145320129. The reversal of 1145320123 is 3210235411.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3210235411 = 31 ⋅103555981.

It is a cyclic number.

It is not a de Polignac number, because 1145320123 - 2⁹ = 1145319611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1145320094 and 1145320103.

It is not an unprimeable number, because it can be changed into a prime (1145320129) 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, 644728 + ... + 646501.

It is an arithmetic number, because the mean of its divisors is an integer number (286653060).

Almost surely, 2^1145320123 is an apocalyptic number.

1145320123 is a deficient number, since it is larger than the sum of its proper divisors (1292117).

1145320123 is an equidigital number, since it uses as much as digits as its factorization.

1145320123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292116.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1145320123 is about 33842.5785512865. The cubic root of 1145320123 is about 1046.2664446932.

Adding to 1145320123 its reverse (3210235411), we get a palindrome (4355555534).

The spelling of 1145320123 in words is "one billion, one hundred forty-five million, three hundred twenty thousand, one hundred twenty-three".