1223250442549 has 2 divisors, whose sum is σ = 1223250442550. Its totient is φ = 1223250442548.

The previous prime is 1223250442501. The next prime is 1223250442553. The reversal of 1223250442549 is 9452440523221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 807135137649 + 416115304900 = 898407^2 + 645070^2 .

It is an emirp because it is prime and its reverse (9452440523221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223250442549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223250442649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611625221274 + 611625221275.

It is an arithmetic number, because the mean of its divisors is an integer number (611625221275).

Almost surely, 2^{1223250442549} is an apocalyptic number.

It is an amenable number.

1223250442549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223250442549 is an equidigital number, since it uses as much as digits as its factorization.

1223250442549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 1223250442549 in words is "one trillion, two hundred twenty-three billion, two hundred fifty million, four hundred forty-two thousand, five hundred forty-nine".