1215224501 has 2 divisors, whose sum is σ = 1215224502. Its totient is φ = 1215224500.

The previous prime is 1215224489. The next prime is 1215224567. The reversal of 1215224501 is 1054225121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1092236401 + 122988100 = 33049^2 + 11090^2 .

It is an emirp because it is prime and its reverse (1054225121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1215224501 - 2²⁶ = 1148115637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215224201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607612250 + 607612251.

It is an arithmetic number, because the mean of its divisors is an integer number (607612251).

Almost surely, 2^1215224501 is an apocalyptic number.

It is an amenable number.

1215224501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215224501 is an equidigital number, since it uses as much as digits as its factorization.

1215224501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1215224501 is about 34860.0702953967. The cubic root of 1215224501 is about 1067.1337096126.

Adding to 1215224501 its reverse (1054225121), we get a palindrome (2269449622).

The spelling of 1215224501 in words is "one billion, two hundred fifteen million, two hundred twenty-four thousand, five hundred one".