1220896813 has 16 divisors (see below), whose sum is σ = 1298880000. Its totient is φ = 1144344240.

The previous prime is 1220896763. The next prime is 1220896823. The reversal of 1220896813 is 3186980221.

It is a cyclic number.

It is not a de Polignac number, because 1220896813 - 2⁹ = 1220896301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220896823) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1241520 + ... + 1242502.

It is an arithmetic number, because the mean of its divisors is an integer number (81180000).

Almost surely, 2^1220896813 is an apocalyptic number.

It is an amenable number.

1220896813 is a deficient number, since it is larger than the sum of its proper divisors (77983187).

1220896813 is a wasteful number, since it uses less digits than its factorization.

1220896813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1220896813 is about 34941.3338755120. Note that the first 3 decimals coincide. The cubic root of 1220896813 is about 1068.7914887944.

The spelling of 1220896813 in words is "one billion, two hundred twenty million, eight hundred ninety-six thousand, eight hundred thirteen".