1145221111 has 4 divisors (see below), whose sum is σ = 1145428312. Its totient is φ = 1145013912.

The previous prime is 1145221109. The next prime is 1145221141. The reversal of 1145221111 is 1111225411.

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

It is a cyclic number.

It is not a de Polignac number, because 1145221111 - 2¹ = 1145221109 is a prime.

It is a super-4 number, since 4×1145221111⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145221141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95076 + ... + 106441.

It is an arithmetic number, because the mean of its divisors is an integer number (286357078).

Almost surely, 2^1145221111 is an apocalyptic number.

1145221111 is a deficient number, since it is larger than the sum of its proper divisors (207201).

1145221111 is an equidigital number, since it uses as much as digits as its factorization.

1145221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207200.

The product of its digits is 80, while the sum is 19.

The square root of 1145221111 is about 33841.1156878729. The cubic root of 1145221111 is about 1046.2362941945.

Adding to 1145221111 its reverse (1111225411), we get a palindrome (2256446522).

It can be divided in two parts, 114 and 5221111, that added together give a palindrome (5221225).

The spelling of 1145221111 in words is "one billion, one hundred forty-five million, two hundred twenty-one thousand, one hundred eleven".