1220520528361 has 2 divisors, whose sum is σ = 1220520528362. Its totient is φ = 1220520528360.

The previous prime is 1220520528343. The next prime is 1220520528377. The reversal of 1220520528361 is 1638250250221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1116953059600 + 103567468761 = 1056860^2 + 321819^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220520528361 - 2¹³ = 1220520520169 is a prime.

It is a super-2 number, since 2×1220520528361² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1220520528361.

It is not a weakly prime, because it can be changed into another prime (1220520528341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610260264180 + 610260264181.

It is an arithmetic number, because the mean of its divisors is an integer number (610260264181).

Almost surely, 2^{1220520528361} is an apocalyptic number.

It is an amenable number.

1220520528361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220520528361 is an equidigital number, since it uses as much as digits as its factorization.

1220520528361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 1220520528361 its reverse (1638250250221), we get a palindrome (2858770778582).

The spelling of 1220520528361 in words is "one trillion, two hundred twenty billion, five hundred twenty million, five hundred twenty-eight thousand, three hundred sixty-one".