1213116505 has 8 divisors (see below), whose sum is σ = 1466366472. Its totient is φ = 963408768.

The previous prime is 1213116469. The next prime is 1213116517. The reversal of 1213116505 is 5056113121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 265461849 + 947654656 = 16293^2 + 30784^2 .

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 1213116505 - 2¹⁵ = 1213083737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213116505.

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, 884802 + ... + 886171.

It is an arithmetic number, because the mean of its divisors is an integer number (183295809).

Almost surely, 2^1213116505 is an apocalyptic number.

It is an amenable number.

1213116505 is a deficient number, since it is larger than the sum of its proper divisors (253249967).

1213116505 is a wasteful number, since it uses less digits than its factorization.

1213116505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771115.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1213116505 is about 34829.8220638579. The cubic root of 1213116505 is about 1066.5163159938.

Adding to 1213116505 its reverse (5056113121), we get a palindrome (6269229626).

The spelling of 1213116505 in words is "one billion, two hundred thirteen million, one hundred sixteen thousand, five hundred five".