1145253221 has 16 divisors (see below), whose sum is σ = 1321402368. Its totient is φ = 972270000.

The previous prime is 1145253211. The next prime is 1145253233. The reversal of 1145253221 is 1223525411.

It is a cyclic number.

It is not a de Polignac number, because 1145253221 - 2²² = 1141058917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145253211) 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 15 ways as a sum of consecutive naturals, for example, 687836 + ... + 689498.

It is an arithmetic number, because the mean of its divisors is an integer number (82587648).

Almost surely, 2^1145253221 is an apocalyptic number.

It is an amenable number.

1145253221 is a deficient number, since it is larger than the sum of its proper divisors (176149147).

1145253221 is a wasteful number, since it uses less digits than its factorization.

1145253221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552.

The product of its digits is 2400, while the sum is 26.

The square root of 1145253221 is about 33841.5901074403. The cubic root of 1145253221 is about 1046.2460723160.

Adding to 1145253221 its reverse (1223525411), we get a palindrome (2368778632).

The spelling of 1145253221 in words is "one billion, one hundred forty-five million, two hundred fifty-three thousand, two hundred twenty-one".