1213355505 has 32 divisors (see below), whose sum is σ = 2018649600. Its totient is φ = 621592832.

The previous prime is 1213355483. The next prime is 1213355509. The reversal of 1213355505 is 5055533121.

It is a cyclic number.

It is not a de Polignac number, because 1213355505 - 2¹² = 1213351409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213355509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78616 + ... + 92774.

It is an arithmetic number, because the mean of its divisors is an integer number (63082800).

Almost surely, 2^1213355505 is an apocalyptic number.

1213355505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213355505 is a deficient number, since it is larger than the sum of its proper divisors (805294095).

1213355505 is a wasteful number, since it uses less digits than its factorization.

1213355505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14393.

The product of its (nonzero) digits is 11250, while the sum is 30.

The square root of 1213355505 is about 34833.2528627460. The cubic root of 1213355505 is about 1066.5863506692.

Adding to 1213355505 its reverse (5055533121), we get a palindrome (6268888626).

The spelling of 1213355505 in words is "one billion, two hundred thirteen million, three hundred fifty-five thousand, five hundred five".