1145423555 has 4 divisors (see below), whose sum is σ = 1374508272. Its totient is φ = 916338840.

The previous prime is 1145423533. The next prime is 1145423561. The reversal of 1145423555 is 5553245411.

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

It is not a de Polignac number, because 1145423555 - 2¹² = 1145419459 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 3 ways as a sum of consecutive naturals, for example, 114542351 + ... + 114542360.

It is an arithmetic number, because the mean of its divisors is an integer number (343627068).

Almost surely, 2^1145423555 is an apocalyptic number.

1145423555 is a deficient number, since it is larger than the sum of its proper divisors (229084717).

1145423555 is an equidigital number, since it uses as much as digits as its factorization.

1145423555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229084716.

The product of its digits is 60000, while the sum is 35.

The square root of 1145423555 is about 33844.1066509370. The cubic root of 1145423555 is about 1046.2979392862.

Adding to 1145423555 its reverse (5553245411), we get a palindrome (6698668966).

The spelling of 1145423555 in words is "one billion, one hundred forty-five million, four hundred twenty-three thousand, five hundred fifty-five".