1220896811 has 8 divisors (see below), whose sum is σ = 1257911424. Its totient is φ = 1184226880.

The previous prime is 1220896763. The next prime is 1220896823. The reversal of 1220896811 is 1186980221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220896811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220896891) 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 7 ways as a sum of consecutive naturals, for example, 78971 + ... + 93156.

It is an arithmetic number, because the mean of its divisors is an integer number (157238928).

Almost surely, 2^1220896811 is an apocalyptic number.

1220896811 is a deficient number, since it is larger than the sum of its proper divisors (37014613).

1220896811 is a wasteful number, since it uses less digits than its factorization.

1220896811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172341.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 1220896811 is about 34941.3338468926. Note that the first 3 decimals coincide. The cubic root of 1220896811 is about 1068.7914882108.

The spelling of 1220896811 in words is "one billion, two hundred twenty million, eight hundred ninety-six thousand, eight hundred eleven".