1243225121 has 2 divisors, whose sum is σ = 1243225122. Its totient is φ = 1243225120.

The previous prime is 1243225117. The next prime is 1243225127. The reversal of 1243225121 is 1215223421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1055535121 + 187690000 = 32489^2 + 13700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243225121 - 2² = 1243225117 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243225127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621612560 + 621612561.

It is an arithmetic number, because the mean of its divisors is an integer number (621612561).

Almost surely, 2^1243225121 is an apocalyptic number.

It is an amenable number.

1243225121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243225121 is an equidigital number, since it uses as much as digits as its factorization.

1243225121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 1243225121 is about 35259.3976267321. The cubic root of 1243225121 is about 1075.2676805193.

Adding to 1243225121 its reverse (1215223421), we get a palindrome (2458448542).

It can be divided in two parts, 1243225 and 121, that multiplied together give a square (150430225 = 12265²).

The spelling of 1243225121 in words is "one billion, two hundred forty-three million, two hundred twenty-five thousand, one hundred twenty-one".