1212765115 has 4 divisors (see below), whose sum is σ = 1455318144. Its totient is φ = 970212088.

The previous prime is 1212765097. The next prime is 1212765143. The reversal of 1212765115 is 5115672121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212765115 - 2⁵ = 1212765083 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121276507 + ... + 121276516.

It is an arithmetic number, because the mean of its divisors is an integer number (363829536).

Almost surely, 2^1212765115 is an apocalyptic number.

1212765115 is a deficient number, since it is larger than the sum of its proper divisors (242553029).

1212765115 is an equidigital number, since it uses as much as digits as its factorization.

1212765115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242553028.

The product of its digits is 4200, while the sum is 31.

The square root of 1212765115 is about 34824.7773144352. Note that the first 3 decimals coincide. The cubic root of 1212765115 is about 1066.4133307331.

The spelling of 1212765115 in words is "one billion, two hundred twelve million, seven hundred sixty-five thousand, one hundred fifteen".