1213563255 has 8 divisors (see below), whose sum is σ = 1941701232. Its totient is φ = 647233728.

The previous prime is 1213563251. The next prime is 1213563289. The reversal of 1213563255 is 5523653121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213563255 - 2² = 1213563251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213563251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40452094 + ... + 40452123.

It is an arithmetic number, because the mean of its divisors is an integer number (242712654).

Almost surely, 2^1213563255 is an apocalyptic number.

1213563255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1213563255 is a deficient number, since it is larger than the sum of its proper divisors (728137977).

1213563255 is an equidigital number, since it uses as much as digits as its factorization.

1213563255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80904225.

The product of its digits is 27000, while the sum is 33.

The square root of 1213563255 is about 34836.2347994154. The cubic root of 1213563255 is about 1066.6472206199.

The spelling of 1213563255 in words is "one billion, two hundred thirteen million, five hundred sixty-three thousand, two hundred fifty-five".