1213055011 has 8 divisors (see below), whose sum is σ = 1387701504. Its totient is φ = 1038746760.

The previous prime is 1213054963. The next prime is 1213055021. The reversal of 1213055011 is 1105503121.

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 1213055011 - 2¹⁹ = 1212530723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213055011.

It is not an unprimeable number, because it can be changed into a prime (1213055021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76825 + ... + 91258.

It is an arithmetic number, because the mean of its divisors is an integer number (173462688).

Almost surely, 2^1213055011 is an apocalyptic number.

1213055011 is a deficient number, since it is larger than the sum of its proper divisors (174646493).

1213055011 is a wasteful number, since it uses less digits than its factorization.

1213055011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169121.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1213055011 is about 34828.9392746894. The cubic root of 1213055011 is about 1066.4982947891.

Adding to 1213055011 its reverse (1105503121), we get a palindrome (2318558132).

The spelling of 1213055011 in words is "one billion, two hundred thirteen million, fifty-five thousand, eleven".