1215206441 has 2 divisors, whose sum is σ = 1215206442. Its totient is φ = 1215206440.

The previous prime is 1215206431. The next prime is 1215206453. The reversal of 1215206441 is 1446025121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 757075225 + 458131216 = 27515^2 + 21404^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215206441 - 2¹⁴ = 1215190057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1215206441.

It is not a weakly prime, because it can be changed into another prime (1215206431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607603220 + 607603221.

It is an arithmetic number, because the mean of its divisors is an integer number (607603221).

Almost surely, 2^1215206441 is an apocalyptic number.

It is an amenable number.

1215206441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215206441 is an equidigital number, since it uses as much as digits as its factorization.

1215206441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1215206441 is about 34859.8112588121. The cubic root of 1215206441 is about 1067.1284232011.

The spelling of 1215206441 in words is "one billion, two hundred fifteen million, two hundred six thousand, four hundred forty-one".