1220544052381 has 2 divisors, whose sum is σ = 1220544052382. Its totient is φ = 1220544052380.

The previous prime is 1220544052379. The next prime is 1220544052391. The reversal of 1220544052381 is 1832504450221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1035937196100 + 184606856281 = 1017810^2 + 429659^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220544052381 - 2¹ = 1220544052379 is a prime.

It is a super-2 number, since 2×1220544052381² (a number of 25 digits) contains 22 as substring.

Together with 1220544052379, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1220544052381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220544052391) 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, 610272026190 + 610272026191.

It is an arithmetic number, because the mean of its divisors is an integer number (610272026191).

Almost surely, 2^{1220544052381} is an apocalyptic number.

It is an amenable number.

1220544052381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220544052381 is an equidigital number, since it uses as much as digits as its factorization.

1220544052381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76800, while the sum is 37.

The spelling of 1220544052381 in words is "one trillion, two hundred twenty billion, five hundred forty-four million, fifty-two thousand, three hundred eighty-one".