1220657081 has 32 divisors (see below), whose sum is σ = 1492992000. Its totient is φ = 995683920.

The previous prime is 1220657059. The next prime is 1220657111. The reversal of 1220657081 is 1807560221.

It is not a de Polignac number, because 1220657081 - 2¹⁸ = 1220394937 is a prime.

It is a super-2 number, since 2×1220657081² = 2980007418790881122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220657041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2831936 + ... + 2832366.

It is an arithmetic number, because the mean of its divisors is an integer number (46656000).

Almost surely, 2^1220657081 is an apocalyptic number.

It is an amenable number.

1220657081 is a deficient number, since it is larger than the sum of its proper divisors (272334919).

1220657081 is an equidigital number, since it uses as much as digits as its factorization.

1220657081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 1220657081 is about 34937.9032141312. The cubic root of 1220657081 is about 1068.7215292120.

The spelling of 1220657081 in words is "one billion, two hundred twenty million, six hundred fifty-seven thousand, eighty-one".