1225111243501 has 2 divisors, whose sum is σ = 1225111243502. Its totient is φ = 1225111243500.

The previous prime is 1225111243469. The next prime is 1225111243507. The reversal of 1225111243501 is 1053421115221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 996904399401 + 228206844100 = 998451^2 + 477710^2 .

It is an emirp because it is prime and its reverse (1053421115221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1225111243501 - 2⁵ = 1225111243469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1225111243501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225111243507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612555621750 + 612555621751.

It is an arithmetic number, because the mean of its divisors is an integer number (612555621751).

Almost surely, 2^{1225111243501} is an apocalyptic number.

It is an amenable number.

1225111243501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225111243501 is an equidigital number, since it uses as much as digits as its factorization.

1225111243501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 1225111243501 its reverse (1053421115221), we get a palindrome (2278532358722).

The spelling of 1225111243501 in words is "one trillion, two hundred twenty-five billion, one hundred eleven million, two hundred forty-three thousand, five hundred one".