1445220111 has 32 divisors (see below), whose sum is σ = 2115606528. Its totient is φ = 874748160.

The previous prime is 1445220109. The next prime is 1445220121. The reversal of 1445220111 is 1110225441.

It is not a de Polignac number, because 1445220111 - 2¹ = 1445220109 is a prime.

It is a super-2 number, since 2×1445220111² = 4177322338477704642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445220121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97770 + ... + 111576.

It is an arithmetic number, because the mean of its divisors is an integer number (66112704).

Almost surely, 2^1445220111 is an apocalyptic number.

1445220111 is a deficient number, since it is larger than the sum of its proper divisors (670386417).

1445220111 is a wasteful number, since it uses less digits than its factorization.

1445220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13911.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1445220111 is about 38016.0507023020. The cubic root of 1445220111 is about 1130.6061203834.

Adding to 1445220111 its reverse (1110225441), we get a palindrome (2555445552).

The spelling of 1445220111 in words is "one billion, four hundred forty-five million, two hundred twenty thousand, one hundred eleven".