1215441365 has 12 divisors (see below), whose sum is σ = 1463131332. Its totient is φ = 969292800.

The previous prime is 1215441361. The next prime is 1215441377. The reversal of 1215441365 is 5631445121.

It can be written as a sum of positive squares in 6 ways, for example, as 55562116 + 1159879249 = 7454^2 + 34057^2 .

It is not a de Polignac number, because 1215441365 - 2² = 1215441361 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215441361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1805669 + ... + 1806341.

It is an arithmetic number, because the mean of its divisors is an integer number (121927611).

Almost surely, 2^1215441365 is an apocalyptic number.

It is an amenable number.

1215441365 is a deficient number, since it is larger than the sum of its proper divisors (247689967).

1215441365 is an frugal number, since it uses more digits than its factorization.

1215441365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880 (or 1279 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 1215441365 is about 34863.1806495047. The cubic root of 1215441365 is about 1067.1971846110.

Adding to 1215441365 its reverse (5631445121), we get a palindrome (6846886486).

The spelling of 1215441365 in words is "one billion, two hundred fifteen million, four hundred forty-one thousand, three hundred sixty-five".