1213122015 has 80 divisors (see below), whose sum is σ = 2496046080. Its totient is φ = 552173760.

The previous prime is 1213121999. The next prime is 1213122017. The reversal of 1213122015 is 5102213121.

It is not a de Polignac number, because 1213122015 - 2⁴ = 1213121999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213122017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 767496 + ... + 769074.

It is an arithmetic number, because the mean of its divisors is an integer number (31200576).

Almost surely, 2^1213122015 is an apocalyptic number.

1213122015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1213122015 is an abundant number, since it is smaller than the sum of its proper divisors (1282924065).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213122015 is a wasteful number, since it uses less digits than its factorization.

1213122015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874 (or 1865 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1213122015 is about 34829.9011626505. The cubic root of 1213122015 is about 1066.5179307044.

Adding to 1213122015 its reverse (5102213121), we get a palindrome (6315335136).

The spelling of 1213122015 in words is "one billion, two hundred thirteen million, one hundred twenty-two thousand, fifteen".