1220326641 has 20 divisors (see below), whose sum is σ = 1885821300. Its totient is φ = 785496096.

The previous prime is 1220326633. The next prime is 1220326649. The reversal of 1220326641 is 1466230221.

1220326641 is a `hidden beast` number, since 12 + 2 + 0 + 3 + 2 + 6 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (1220326633) and next prime (1220326649).

It can be written as a sum of positive squares in 2 ways, for example, as 621056241 + 599270400 = 24921^2 + 24480^2 .

It is not a de Polignac number, because 1220326641 - 2³ = 1220326633 is a prime.

It is a super-2 number, since 2×1220326641² = 2978394221468685762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1220326649) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 257406 + ... + 262103.

It is an arithmetic number, because the mean of its divisors is an integer number (94291065).

Almost surely, 2^1220326641 is an apocalyptic number.

It is an amenable number.

1220326641 is a deficient number, since it is larger than the sum of its proper divisors (665494659).

1220326641 is an equidigital number, since it uses as much as digits as its factorization.

1220326641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519550 (or 519541 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1220326641 is about 34933.1739325244. The cubic root of 1220326641 is about 1068.6250838306.

Adding to 1220326641 its reverse (1466230221), we get a palindrome (2686556862).

The spelling of 1220326641 in words is "one billion, two hundred twenty million, three hundred twenty-six thousand, six hundred forty-one".