1445121215 has 4 divisors (see below), whose sum is σ = 1734145464. Its totient is φ = 1156096968.

The previous prime is 1445121199. The next prime is 1445121233. The reversal of 1445121215 is 5121215441.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5121215441 = 773 ⋅6625117.

It is a cyclic number.

It is not a de Polignac number, because 1445121215 - 2⁴ = 1445121199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 144512117 + ... + 144512126.

It is an arithmetic number, because the mean of its divisors is an integer number (433536366).

Almost surely, 2^1445121215 is an apocalyptic number.

1445121215 is a deficient number, since it is larger than the sum of its proper divisors (289024249).

1445121215 is an equidigital number, since it uses as much as digits as its factorization.

1445121215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289024248.

The product of its digits is 1600, while the sum is 26.

The square root of 1445121215 is about 38014.7499662960. The cubic root of 1445121215 is about 1130.5803307770.

Adding to 1445121215 its reverse (5121215441), we get a palindrome (6566336656).

The spelling of 1445121215 in words is "one billion, four hundred forty-five million, one hundred twenty-one thousand, two hundred fifteen".