1216013255 has 4 divisors (see below), whose sum is σ = 1459215912. Its totient is φ = 972810600.

The previous prime is 1216013221. The next prime is 1216013261. The reversal of 1216013255 is 5523106121.

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

It is not a de Polignac number, because 1216013255 - 2¹⁸ = 1215751111 is a prime.

It is a super-3 number, since 3×1216013255³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 121601321 + ... + 121601330.

It is an arithmetic number, because the mean of its divisors is an integer number (364803978).

Almost surely, 2^1216013255 is an apocalyptic number.

1216013255 is a deficient number, since it is larger than the sum of its proper divisors (243202657).

1216013255 is an equidigital number, since it uses as much as digits as its factorization.

1216013255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243202656.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1216013255 is about 34871.3816044045. The cubic root of 1216013255 is about 1067.3645377273.

Adding to 1216013255 its reverse (5523106121), we get a palindrome (6739119376).

The spelling of 1216013255 in words is "one billion, two hundred sixteen million, thirteen thousand, two hundred fifty-five".