1215533445 has 48 divisors (see below), whose sum is σ = 2265900480. Its totient is φ = 554808576.

The previous prime is 1215533441. The next prime is 1215533453. The reversal of 1215533445 is 5443355121.

It is not a de Polignac number, because 1215533445 - 2² = 1215533441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215533441) 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 47 ways as a sum of consecutive naturals, for example, 942361 + ... + 943649.

It is an arithmetic number, because the mean of its divisors is an integer number (47206260).

Almost surely, 2^1215533445 is an apocalyptic number.

1215533445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215533445 is a deficient number, since it is larger than the sum of its proper divisors (1050367035).

1215533445 is a wasteful number, since it uses less digits than its factorization.

1215533445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2594 (or 2587 counting only the distinct ones).

The product of its digits is 36000, while the sum is 33.

The square root of 1215533445 is about 34864.5012154197. The cubic root of 1215533445 is about 1067.2241336788.

Adding to 1215533445 its reverse (5443355121), we get a palindrome (6658888566).

The spelling of 1215533445 in words is "one billion, two hundred fifteen million, five hundred thirty-three thousand, four hundred forty-five".