1445221111 has 8 divisors (see below), whose sum is σ = 1523025920. Its totient is φ = 1367590392.

The previous prime is 1445221097. The next prime is 1445221157. The reversal of 1445221111 is 1111225441.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1445221111 - 2⁹ = 1445220599 is a prime.

It is a super-4 number, since 4×1445221111⁴ (a number of 38 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 (1445221171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26295 + ... + 59848.

It is an arithmetic number, because the mean of its divisors is an integer number (190378240).

Almost surely, 2^1445221111 is an apocalyptic number.

1445221111 is a deficient number, since it is larger than the sum of its proper divisors (77804809).

1445221111 is an equidigital number, since it uses as much as digits as its factorization.

1445221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87045.

The product of its digits is 320, while the sum is 22.

The square root of 1445221111 is about 38016.0638546391. The cubic root of 1445221111 is about 1130.6063811524.

Adding to 1445221111 its reverse (1111225441), we get a palindrome (2556446552).

The spelling of 1445221111 in words is "one billion, four hundred forty-five million, two hundred twenty-one thousand, one hundred eleven".