1215120345 has 16 divisors (see below), whose sum is σ = 1945743360. Its totient is φ = 647547264.

The previous prime is 1215120317. The next prime is 1215120349. The reversal of 1215120345 is 5430215121.

It is a happy number.

It is not a de Polignac number, because 1215120345 - 2⁹ = 1215119833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215120349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12484 + ... + 50853.

It is an arithmetic number, because the mean of its divisors is an integer number (121608960).

Almost surely, 2^1215120345 is an apocalyptic number.

1215120345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215120345 is a deficient number, since it is larger than the sum of its proper divisors (730623015).

1215120345 is a wasteful number, since it uses less digits than its factorization.

1215120345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64624.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1215120345 is about 34858.5763478660. The cubic root of 1215120345 is about 1067.1032209925.

Adding to 1215120345 its reverse (5430215121), we get a palindrome (6645335466).

The spelling of 1215120345 in words is "one billion, two hundred fifteen million, one hundred twenty thousand, three hundred forty-five".