1215611051 has 8 divisors (see below), whose sum is σ = 1280477520. Its totient is φ = 1150833312.

The previous prime is 1215611041. The next prime is 1215611069. The reversal of 1215611051 is 1501165121.

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 1215611051 - 2¹⁰ = 1215610027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215611011) 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 7 ways as a sum of consecutive naturals, for example, 6941 + ... + 49793.

It is an arithmetic number, because the mean of its divisors is an integer number (160059690).

Almost surely, 2^1215611051 is an apocalyptic number.

1215611051 is a deficient number, since it is larger than the sum of its proper divisors (64866469).

1215611051 is a wasteful number, since it uses less digits than its factorization.

1215611051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44365.

The product of its (nonzero) digits is 300, while the sum is 23.

The square root of 1215611051 is about 34865.6141635279. The cubic root of 1215611051 is about 1067.2468455820.

Adding to 1215611051 its reverse (1501165121), we get a palindrome (2716776172).

The spelling of 1215611051 in words is "one billion, two hundred fifteen million, six hundred eleven thousand, fifty-one".