1220841681 has 32 divisors (see below), whose sum is σ = 1730319360. Its totient is φ = 764334144.

The previous prime is 1220841673. The next prime is 1220841683. The reversal of 1220841681 is 1861480221.

It is not a de Polignac number, because 1220841681 - 2³ = 1220841673 is a prime.

It is a super-2 number, since 2×1220841681² = 2980908820133811522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220841683) 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 31 ways as a sum of consecutive naturals, for example, 1147956 + ... + 1149018.

It is an arithmetic number, because the mean of its divisors is an integer number (54072480).

Almost surely, 2^1220841681 is an apocalyptic number.

It is an amenable number.

1220841681 is a deficient number, since it is larger than the sum of its proper divisors (509477679).

1220841681 is a wasteful number, since it uses less digits than its factorization.

1220841681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 1220841681 is about 34940.5449442335. The cubic root of 1220841681 is about 1068.7754007574.

The spelling of 1220841681 in words is "one billion, two hundred twenty million, eight hundred forty-one thousand, six hundred eighty-one".