1215311245 has 8 divisors (see below), whose sum is σ = 1469019384. Its totient is φ = 965151744.

The previous prime is 1215311233. The next prime is 1215311257. The reversal of 1215311245 is 5421135121.

It is an interprime number because it is at equal distance from previous prime (1215311233) and next prime (1215311257).

It can be written as a sum of positive squares in 4 ways, for example, as 113934276 + 1101376969 = 10674^2 + 33187^2 .

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 1215311245 - 2¹¹ = 1215309197 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 886404 + ... + 887773.

It is an arithmetic number, because the mean of its divisors is an integer number (183627423).

Almost surely, 2^1215311245 is an apocalyptic number.

It is an amenable number.

1215311245 is a deficient number, since it is larger than the sum of its proper divisors (253708139).

1215311245 is a wasteful number, since it uses less digits than its factorization.

1215311245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774319.

The product of its digits is 1200, while the sum is 25.

The square root of 1215311245 is about 34861.3144473928. The cubic root of 1215311245 is about 1067.1591000497.

Adding to 1215311245 its reverse (5421135121), we get a palindrome (6636446366).

The spelling of 1215311245 in words is "one billion, two hundred fifteen million, three hundred eleven thousand, two hundred forty-five".