1215120653 has 2 divisors, whose sum is σ = 1215120654. Its totient is φ = 1215120652.

The previous prime is 1215120637. The next prime is 1215120667. The reversal of 1215120653 is 3560215121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1036711204 + 178409449 = 32198^2 + 13357^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215120653 - 2⁴ = 1215120637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215120853) 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, 607560326 + 607560327.

It is an arithmetic number, because the mean of its divisors is an integer number (607560327).

Almost surely, 2^1215120653 is an apocalyptic number.

It is an amenable number.

1215120653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215120653 is an equidigital number, since it uses as much as digits as its factorization.

1215120653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1215120653 is about 34858.5807657168. The cubic root of 1215120653 is about 1067.1033111531.

Adding to 1215120653 its reverse (3560215121), we get a palindrome (4775335774).

The spelling of 1215120653 in words is "one billion, two hundred fifteen million, one hundred twenty thousand, six hundred fifty-three".